var isStart=true;
var nn;
var tt;

nn=1;




function setFocus(i)
{
 if(tt) clearTimeout(tt);
 nn = i;
 selectLayer1(i);

}
function selectLayer1(i)
{
 switch(i)
 {
 case 1:
document.getElementById("bbs_s1").style.display="block";
document.getElementById("bbs_s2").style.display="none";
document.getElementById("bbs_s3").style.display="none";
document.getElementById("bbs_s4").style.display="none";
document.getElementById("bbs_s5").style.display="none";
document.getElementById("bbs_s6").style.display="none";
document.getElementById("bbs_s7").style.display="none";
document.getElementById("bbs_s8").style.display="none";
document.getElementById("bbs_s9").style.display="none";
document.getElementById("bbs_s10").style.display="none";
document.getElementById("bbs_s11").style.display="none";
document.getElementById("bbs_s12").style.display="none";
document.getElementById("bbs_s13").style.display="none";
document.getElementById("bbs_s14").style.display="none";
document.getElementById("bbs_s15").style.display="none";
document.getElementById("bbs_s16").style.display="none";
document.getElementById("bbs_s17").style.display="none";
document.getElementById("bbs_s18").style.display="none";
document.getElementById("bbs_s19").style.display="none";
document.getElementById("bbs_s20").style.display="none";
document.getElementById("bbs_s21").style.display="none";
document.getElementById("bbs_s22").style.display="none";
document.getElementById("bbs_s23").style.display="none";
document.getElementById("bbs_s24").style.display="none";
document.getElementById("bbs_s25").style.display="none";
document.getElementById("bbs_s26").style.display="none";
 break;
case 2:
document.getElementById("bbs_s1").style.display="none";
document.getElementById("bbs_s2").style.display="block";
document.getElementById("bbs_s3").style.display="none";
document.getElementById("bbs_s4").style.display="none";
document.getElementById("bbs_s5").style.display="none";
document.getElementById("bbs_s6").style.display="none";
document.getElementById("bbs_s7").style.display="none";
document.getElementById("bbs_s8").style.display="none";
document.getElementById("bbs_s9").style.display="none";
document.getElementById("bbs_s10").style.display="none";
document.getElementById("bbs_s11").style.display="none";
document.getElementById("bbs_s12").style.display="none";
document.getElementById("bbs_s13").style.display="none";
document.getElementById("bbs_s14").style.display="none";
document.getElementById("bbs_s15").style.display="none";
document.getElementById("bbs_s16").style.display="none";
document.getElementById("bbs_s17").style.display="none";
document.getElementById("bbs_s18").style.display="none";
document.getElementById("bbs_s19").style.display="none";
document.getElementById("bbs_s20").style.display="none";
document.getElementById("bbs_s21").style.display="none";
document.getElementById("bbs_s22").style.display="none";
document.getElementById("bbs_s23").style.display="none";
document.getElementById("bbs_s24").style.display="none";
document.getElementById("bbs_s25").style.display="none";
document.getElementById("bbs_s26").style.display="none";
 break;
 case 3:
document.getElementById("bbs_s1").style.display="none";
document.getElementById("bbs_s2").style.display="none";
document.getElementById("bbs_s3").style.display="block";
document.getElementById("bbs_s4").style.display="none";
document.getElementById("bbs_s5").style.display="none";
document.getElementById("bbs_s6").style.display="none";
document.getElementById("bbs_s7").style.display="none";
document.getElementById("bbs_s8").style.display="none";
document.getElementById("bbs_s9").style.display="none";
document.getElementById("bbs_s10").style.display="none";
document.getElementById("bbs_s11").style.display="none";
document.getElementById("bbs_s12").style.display="none";
document.getElementById("bbs_s13").style.display="none";
document.getElementById("bbs_s14").style.display="none";
document.getElementById("bbs_s15").style.display="none";
document.getElementById("bbs_s16").style.display="none";
document.getElementById("bbs_s17").style.display="none";
document.getElementById("bbs_s18").style.display="none";
document.getElementById("bbs_s19").style.display="none";
document.getElementById("bbs_s20").style.display="none";
document.getElementById("bbs_s21").style.display="none";
document.getElementById("bbs_s22").style.display="none";
document.getElementById("bbs_s23").style.display="none";
document.getElementById("bbs_s24").style.display="none";
document.getElementById("bbs_s25").style.display="none";
document.getElementById("bbs_s26").style.display="none";
 break;
 case 4:
document.getElementById("bbs_s1").style.display="none";
document.getElementById("bbs_s2").style.display="none";
document.getElementById("bbs_s3").style.display="none";
document.getElementById("bbs_s4").style.display="block";
document.getElementById("bbs_s5").style.display="none";
document.getElementById("bbs_s6").style.display="none";
document.getElementById("bbs_s7").style.display="none";
document.getElementById("bbs_s8").style.display="none";
document.getElementById("bbs_s9").style.display="none";
document.getElementById("bbs_s10").style.display="none";
document.getElementById("bbs_s11").style.display="none";
document.getElementById("bbs_s12").style.display="none";
document.getElementById("bbs_s13").style.display="none";
document.getElementById("bbs_s14").style.display="none";
document.getElementById("bbs_s15").style.display="none";
document.getElementById("bbs_s16").style.display="none";
document.getElementById("bbs_s17").style.display="none";
document.getElementById("bbs_s18").style.display="none";
document.getElementById("bbs_s19").style.display="none";
document.getElementById("bbs_s20").style.display="none";
document.getElementById("bbs_s21").style.display="none";
document.getElementById("bbs_s22").style.display="none";
document.getElementById("bbs_s23").style.display="none";
document.getElementById("bbs_s24").style.display="none";
document.getElementById("bbs_s25").style.display="none";
document.getElementById("bbs_s26").style.display="none";
 break;
 case 5:
document.getElementById("bbs_s1").style.display="none";
document.getElementById("bbs_s2").style.display="none";
document.getElementById("bbs_s3").style.display="none";
document.getElementById("bbs_s4").style.display="none";
document.getElementById("bbs_s5").style.display="block";
document.getElementById("bbs_s6").style.display="none";
document.getElementById("bbs_s7").style.display="none";
document.getElementById("bbs_s8").style.display="none";
document.getElementById("bbs_s9").style.display="none";
document.getElementById("bbs_s10").style.display="none";
document.getElementById("bbs_s11").style.display="none";
document.getElementById("bbs_s12").style.display="none";
document.getElementById("bbs_s13").style.display="none";
document.getElementById("bbs_s14").style.display="none";
document.getElementById("bbs_s15").style.display="none";
document.getElementById("bbs_s16").style.display="none";
document.getElementById("bbs_s17").style.display="none";
document.getElementById("bbs_s18").style.display="none";
document.getElementById("bbs_s19").style.display="none";
document.getElementById("bbs_s20").style.display="none";
document.getElementById("bbs_s21").style.display="none";
document.getElementById("bbs_s22").style.display="none";
document.getElementById("bbs_s23").style.display="none";
document.getElementById("bbs_s24").style.display="none";
document.getElementById("bbs_s25").style.display="none";
document.getElementById("bbs_s26").style.display="none";
 break;
 case 6:
document.getElementById("bbs_s1").style.display="none";
document.getElementById("bbs_s2").style.display="none";
document.getElementById("bbs_s3").style.display="none";
document.getElementById("bbs_s4").style.display="none";
document.getElementById("bbs_s5").style.display="none";
document.getElementById("bbs_s6").style.display="block";
document.getElementById("bbs_s7").style.display="none";
document.getElementById("bbs_s8").style.display="none";
document.getElementById("bbs_s9").style.display="none";
document.getElementById("bbs_s10").style.display="none";
document.getElementById("bbs_s11").style.display="none";
document.getElementById("bbs_s12").style.display="none";
document.getElementById("bbs_s13").style.display="none";
document.getElementById("bbs_s14").style.display="none";
document.getElementById("bbs_s15").style.display="none";
document.getElementById("bbs_s16").style.display="none";
document.getElementById("bbs_s17").style.display="none";
document.getElementById("bbs_s18").style.display="none";
document.getElementById("bbs_s19").style.display="none";
document.getElementById("bbs_s20").style.display="none";
document.getElementById("bbs_s21").style.display="none";
document.getElementById("bbs_s22").style.display="none";
document.getElementById("bbs_s23").style.display="none";
document.getElementById("bbs_s24").style.display="none";
document.getElementById("bbs_s25").style.display="none";
document.getElementById("bbs_s26").style.display="none";
 break;
  case 7:
document.getElementById("bbs_s1").style.display="none";
document.getElementById("bbs_s2").style.display="none";
document.getElementById("bbs_s3").style.display="none";
document.getElementById("bbs_s4").style.display="none";
document.getElementById("bbs_s5").style.display="none";
document.getElementById("bbs_s6").style.display="none";
document.getElementById("bbs_s7").style.display="block";
document.getElementById("bbs_s8").style.display="none";
document.getElementById("bbs_s9").style.display="none";
document.getElementById("bbs_s10").style.display="none";
document.getElementById("bbs_s11").style.display="none";
document.getElementById("bbs_s12").style.display="none";
document.getElementById("bbs_s13").style.display="none";
document.getElementById("bbs_s14").style.display="none";
document.getElementById("bbs_s15").style.display="none";
document.getElementById("bbs_s16").style.display="none";
document.getElementById("bbs_s17").style.display="none";
document.getElementById("bbs_s18").style.display="none";
document.getElementById("bbs_s19").style.display="none";
document.getElementById("bbs_s20").style.display="none";
document.getElementById("bbs_s21").style.display="none";
document.getElementById("bbs_s22").style.display="none";
document.getElementById("bbs_s23").style.display="none";
document.getElementById("bbs_s24").style.display="none";
document.getElementById("bbs_s25").style.display="none";
document.getElementById("bbs_s26").style.display="none";
 break;
   case 8:
document.getElementById("bbs_s1").style.display="none";
document.getElementById("bbs_s2").style.display="none";
document.getElementById("bbs_s3").style.display="none";
document.getElementById("bbs_s4").style.display="none";
document.getElementById("bbs_s5").style.display="none";
document.getElementById("bbs_s6").style.display="none";
document.getElementById("bbs_s7").style.display="none";
document.getElementById("bbs_s8").style.display="block";
document.getElementById("bbs_s9").style.display="none";
document.getElementById("bbs_s10").style.display="none";
document.getElementById("bbs_s11").style.display="none";
document.getElementById("bbs_s12").style.display="none";
document.getElementById("bbs_s13").style.display="none";
document.getElementById("bbs_s14").style.display="none";
document.getElementById("bbs_s15").style.display="none";
document.getElementById("bbs_s16").style.display="none";
document.getElementById("bbs_s17").style.display="none";
document.getElementById("bbs_s18").style.display="none";
document.getElementById("bbs_s19").style.display="none";
document.getElementById("bbs_s20").style.display="none";
document.getElementById("bbs_s21").style.display="none";
document.getElementById("bbs_s22").style.display="none";
document.getElementById("bbs_s23").style.display="none";
document.getElementById("bbs_s24").style.display="none";
document.getElementById("bbs_s25").style.display="none";
document.getElementById("bbs_s26").style.display="none";
 break;
   case 9:
document.getElementById("bbs_s1").style.display="none";
document.getElementById("bbs_s2").style.display="none";
document.getElementById("bbs_s3").style.display="none";
document.getElementById("bbs_s4").style.display="none";
document.getElementById("bbs_s5").style.display="none";
document.getElementById("bbs_s6").style.display="none";
document.getElementById("bbs_s7").style.display="none";
document.getElementById("bbs_s8").style.display="none";
document.getElementById("bbs_s9").style.display="block";
document.getElementById("bbs_s10").style.display="none";
document.getElementById("bbs_s11").style.display="none";
document.getElementById("bbs_s12").style.display="none";
document.getElementById("bbs_s13").style.display="none";
document.getElementById("bbs_s14").style.display="none";
document.getElementById("bbs_s15").style.display="none";
document.getElementById("bbs_s16").style.display="none";
document.getElementById("bbs_s17").style.display="none";
document.getElementById("bbs_s18").style.display="none";
document.getElementById("bbs_s19").style.display="none";
document.getElementById("bbs_s20").style.display="none";
document.getElementById("bbs_s21").style.display="none";
document.getElementById("bbs_s22").style.display="none";
document.getElementById("bbs_s23").style.display="none";
document.getElementById("bbs_s24").style.display="none";
document.getElementById("bbs_s25").style.display="none";
document.getElementById("bbs_s26").style.display="none";
 break;
   case 10:
document.getElementById("bbs_s1").style.display="none";
document.getElementById("bbs_s2").style.display="none";
document.getElementById("bbs_s3").style.display="none";
document.getElementById("bbs_s4").style.display="none";
document.getElementById("bbs_s5").style.display="none";
document.getElementById("bbs_s6").style.display="none";
document.getElementById("bbs_s7").style.display="none";
document.getElementById("bbs_s8").style.display="none";
document.getElementById("bbs_s9").style.display="none";
document.getElementById("bbs_s10").style.display="block";
document.getElementById("bbs_s11").style.display="none";
document.getElementById("bbs_s12").style.display="none";
document.getElementById("bbs_s13").style.display="none";
document.getElementById("bbs_s14").style.display="none";
document.getElementById("bbs_s15").style.display="none";
document.getElementById("bbs_s16").style.display="none";
document.getElementById("bbs_s17").style.display="none";
document.getElementById("bbs_s18").style.display="none";
document.getElementById("bbs_s19").style.display="none";
document.getElementById("bbs_s20").style.display="none";
document.getElementById("bbs_s21").style.display="none";
document.getElementById("bbs_s22").style.display="none";
document.getElementById("bbs_s23").style.display="none";
document.getElementById("bbs_s24").style.display="none";
document.getElementById("bbs_s25").style.display="none";
document.getElementById("bbs_s26").style.display="none";
 break;
   case 11:
document.getElementById("bbs_s1").style.display="none";
document.getElementById("bbs_s2").style.display="none";
document.getElementById("bbs_s3").style.display="none";
document.getElementById("bbs_s4").style.display="none";
document.getElementById("bbs_s5").style.display="none";
document.getElementById("bbs_s6").style.display="none";
document.getElementById("bbs_s7").style.display="none";
document.getElementById("bbs_s8").style.display="none";
document.getElementById("bbs_s9").style.display="none";
document.getElementById("bbs_s10").style.display="none";
document.getElementById("bbs_s11").style.display="block";
document.getElementById("bbs_s12").style.display="none";
document.getElementById("bbs_s13").style.display="none";
document.getElementById("bbs_s14").style.display="none";
document.getElementById("bbs_s15").style.display="none";
document.getElementById("bbs_s16").style.display="none";
document.getElementById("bbs_s17").style.display="none";
document.getElementById("bbs_s18").style.display="none";
document.getElementById("bbs_s19").style.display="none";
document.getElementById("bbs_s20").style.display="none";
document.getElementById("bbs_s21").style.display="none";
document.getElementById("bbs_s22").style.display="none";
document.getElementById("bbs_s23").style.display="none";
document.getElementById("bbs_s24").style.display="none";
document.getElementById("bbs_s25").style.display="none";
document.getElementById("bbs_s26").style.display="none";
 break;
    case 12:
document.getElementById("bbs_s1").style.display="none";
document.getElementById("bbs_s2").style.display="none";
document.getElementById("bbs_s3").style.display="none";
document.getElementById("bbs_s4").style.display="none";
document.getElementById("bbs_s5").style.display="none";
document.getElementById("bbs_s6").style.display="none";
document.getElementById("bbs_s7").style.display="none";
document.getElementById("bbs_s8").style.display="none";
document.getElementById("bbs_s9").style.display="none";
document.getElementById("bbs_s10").style.display="none";
document.getElementById("bbs_s11").style.display="none";
document.getElementById("bbs_s12").style.display="block";
document.getElementById("bbs_s13").style.display="none";
document.getElementById("bbs_s14").style.display="none";
document.getElementById("bbs_s15").style.display="none";
document.getElementById("bbs_s16").style.display="none";
document.getElementById("bbs_s17").style.display="none";
document.getElementById("bbs_s18").style.display="none";
document.getElementById("bbs_s19").style.display="none";
document.getElementById("bbs_s20").style.display="none";
document.getElementById("bbs_s21").style.display="none";
document.getElementById("bbs_s22").style.display="none";
document.getElementById("bbs_s23").style.display="none";
document.getElementById("bbs_s24").style.display="none";
document.getElementById("bbs_s25").style.display="none";
document.getElementById("bbs_s26").style.display="none";
 break;
    case 13:
document.getElementById("bbs_s1").style.display="none";
document.getElementById("bbs_s2").style.display="none";
document.getElementById("bbs_s3").style.display="none";
document.getElementById("bbs_s4").style.display="none";
document.getElementById("bbs_s5").style.display="none";
document.getElementById("bbs_s6").style.display="none";
document.getElementById("bbs_s7").style.display="none";
document.getElementById("bbs_s8").style.display="none";
document.getElementById("bbs_s9").style.display="none";
document.getElementById("bbs_s10").style.display="none";
document.getElementById("bbs_s11").style.display="none";
document.getElementById("bbs_s12").style.display="none";
document.getElementById("bbs_s13").style.display="block";
document.getElementById("bbs_s14").style.display="none";
document.getElementById("bbs_s15").style.display="none";
document.getElementById("bbs_s16").style.display="none";
document.getElementById("bbs_s17").style.display="none";
document.getElementById("bbs_s18").style.display="none";
document.getElementById("bbs_s19").style.display="none";
document.getElementById("bbs_s20").style.display="none";
document.getElementById("bbs_s21").style.display="none";
document.getElementById("bbs_s22").style.display="none";
document.getElementById("bbs_s23").style.display="none";
document.getElementById("bbs_s24").style.display="none";
document.getElementById("bbs_s25").style.display="none";
document.getElementById("bbs_s26").style.display="none";
 break;
    case 14:
document.getElementById("bbs_s1").style.display="none";
document.getElementById("bbs_s2").style.display="none";
document.getElementById("bbs_s3").style.display="none";
document.getElementById("bbs_s4").style.display="none";
document.getElementById("bbs_s5").style.display="none";
document.getElementById("bbs_s6").style.display="none";
document.getElementById("bbs_s7").style.display="none";
document.getElementById("bbs_s8").style.display="none";
document.getElementById("bbs_s9").style.display="none";
document.getElementById("bbs_s10").style.display="none";
document.getElementById("bbs_s11").style.display="none";
document.getElementById("bbs_s12").style.display="none";
document.getElementById("bbs_s13").style.display="none";
document.getElementById("bbs_s14").style.display="block";
document.getElementById("bbs_s15").style.display="none";
document.getElementById("bbs_s16").style.display="none";
document.getElementById("bbs_s17").style.display="none";
document.getElementById("bbs_s18").style.display="none";
document.getElementById("bbs_s19").style.display="none";
document.getElementById("bbs_s20").style.display="none";
document.getElementById("bbs_s21").style.display="none";
document.getElementById("bbs_s22").style.display="none";
document.getElementById("bbs_s23").style.display="none";
document.getElementById("bbs_s24").style.display="none";
document.getElementById("bbs_s25").style.display="none";
document.getElementById("bbs_s26").style.display="none";
 break;
     case 15:
document.getElementById("bbs_s1").style.display="none";
document.getElementById("bbs_s2").style.display="none";
document.getElementById("bbs_s3").style.display="none";
document.getElementById("bbs_s4").style.display="none";
document.getElementById("bbs_s5").style.display="none";
document.getElementById("bbs_s6").style.display="none";
document.getElementById("bbs_s7").style.display="none";
document.getElementById("bbs_s8").style.display="none";
document.getElementById("bbs_s9").style.display="none";
document.getElementById("bbs_s10").style.display="none";
document.getElementById("bbs_s11").style.display="none";
document.getElementById("bbs_s12").style.display="none";
document.getElementById("bbs_s13").style.display="none";
document.getElementById("bbs_s14").style.display="none";
document.getElementById("bbs_s15").style.display="block";
document.getElementById("bbs_s16").style.display="none";
document.getElementById("bbs_s17").style.display="none";
document.getElementById("bbs_s18").style.display="none";
document.getElementById("bbs_s19").style.display="none";
document.getElementById("bbs_s20").style.display="none";
document.getElementById("bbs_s21").style.display="none";
document.getElementById("bbs_s22").style.display="none";
document.getElementById("bbs_s23").style.display="none";
document.getElementById("bbs_s24").style.display="none";
document.getElementById("bbs_s25").style.display="none";
document.getElementById("bbs_s26").style.display="none";
 break;
     case 16:
document.getElementById("bbs_s1").style.display="none";
document.getElementById("bbs_s2").style.display="none";
document.getElementById("bbs_s3").style.display="none";
document.getElementById("bbs_s4").style.display="none";
document.getElementById("bbs_s5").style.display="none";
document.getElementById("bbs_s6").style.display="none";
document.getElementById("bbs_s7").style.display="none";
document.getElementById("bbs_s8").style.display="none";
document.getElementById("bbs_s9").style.display="none";
document.getElementById("bbs_s10").style.display="none";
document.getElementById("bbs_s11").style.display="none";
document.getElementById("bbs_s12").style.display="none";
document.getElementById("bbs_s13").style.display="none";
document.getElementById("bbs_s14").style.display="none";
document.getElementById("bbs_s15").style.display="none";
document.getElementById("bbs_s16").style.display="block";
document.getElementById("bbs_s17").style.display="none";
document.getElementById("bbs_s18").style.display="none";
document.getElementById("bbs_s19").style.display="none";
document.getElementById("bbs_s20").style.display="none";
document.getElementById("bbs_s21").style.display="none";
document.getElementById("bbs_s22").style.display="none";
document.getElementById("bbs_s23").style.display="none";
document.getElementById("bbs_s24").style.display="none";
document.getElementById("bbs_s25").style.display="none";
document.getElementById("bbs_s26").style.display="none";
 break;
     case 17:
document.getElementById("bbs_s1").style.display="none";
document.getElementById("bbs_s2").style.display="none";
document.getElementById("bbs_s3").style.display="none";
document.getElementById("bbs_s4").style.display="none";
document.getElementById("bbs_s5").style.display="none";
document.getElementById("bbs_s6").style.display="none";
document.getElementById("bbs_s7").style.display="none";
document.getElementById("bbs_s8").style.display="none";
document.getElementById("bbs_s9").style.display="none";
document.getElementById("bbs_s10").style.display="none";
document.getElementById("bbs_s11").style.display="none";
document.getElementById("bbs_s12").style.display="none";
document.getElementById("bbs_s13").style.display="none";
document.getElementById("bbs_s14").style.display="none";
document.getElementById("bbs_s15").style.display="none";
document.getElementById("bbs_s16").style.display="none";
document.getElementById("bbs_s17").style.display="block";
document.getElementById("bbs_s18").style.display="none";
document.getElementById("bbs_s19").style.display="none";
document.getElementById("bbs_s20").style.display="none";
document.getElementById("bbs_s21").style.display="none";
document.getElementById("bbs_s22").style.display="none";
document.getElementById("bbs_s23").style.display="none";
document.getElementById("bbs_s24").style.display="none";
document.getElementById("bbs_s25").style.display="none";
document.getElementById("bbs_s26").style.display="none";
 break;
      case 18:
document.getElementById("bbs_s1").style.display="none";
document.getElementById("bbs_s2").style.display="none";
document.getElementById("bbs_s3").style.display="none";
document.getElementById("bbs_s4").style.display="none";
document.getElementById("bbs_s5").style.display="none";
document.getElementById("bbs_s6").style.display="none";
document.getElementById("bbs_s7").style.display="none";
document.getElementById("bbs_s8").style.display="none";
document.getElementById("bbs_s9").style.display="none";
document.getElementById("bbs_s10").style.display="none";
document.getElementById("bbs_s11").style.display="none";
document.getElementById("bbs_s12").style.display="none";
document.getElementById("bbs_s13").style.display="none";
document.getElementById("bbs_s14").style.display="none";
document.getElementById("bbs_s15").style.display="none";
document.getElementById("bbs_s16").style.display="none";
document.getElementById("bbs_s17").style.display="none";
document.getElementById("bbs_s18").style.display="block";
document.getElementById("bbs_s19").style.display="none";
document.getElementById("bbs_s20").style.display="none";
document.getElementById("bbs_s21").style.display="none";
document.getElementById("bbs_s22").style.display="none";
document.getElementById("bbs_s23").style.display="none";
document.getElementById("bbs_s24").style.display="none";
document.getElementById("bbs_s25").style.display="none";
document.getElementById("bbs_s26").style.display="none";
 break;
      case 19:
document.getElementById("bbs_s1").style.display="none";
document.getElementById("bbs_s2").style.display="none";
document.getElementById("bbs_s3").style.display="none";
document.getElementById("bbs_s4").style.display="none";
document.getElementById("bbs_s5").style.display="none";
document.getElementById("bbs_s6").style.display="none";
document.getElementById("bbs_s7").style.display="none";
document.getElementById("bbs_s8").style.display="none";
document.getElementById("bbs_s9").style.display="none";
document.getElementById("bbs_s10").style.display="none";
document.getElementById("bbs_s11").style.display="none";
document.getElementById("bbs_s12").style.display="none";
document.getElementById("bbs_s13").style.display="none";
document.getElementById("bbs_s14").style.display="none";
document.getElementById("bbs_s15").style.display="none";
document.getElementById("bbs_s16").style.display="none";
document.getElementById("bbs_s17").style.display="none";
document.getElementById("bbs_s18").style.display="none";
document.getElementById("bbs_s19").style.display="block";
document.getElementById("bbs_s20").style.display="none";
document.getElementById("bbs_s21").style.display="none";
document.getElementById("bbs_s22").style.display="none";
document.getElementById("bbs_s23").style.display="none";
document.getElementById("bbs_s24").style.display="none";
document.getElementById("bbs_s25").style.display="none";
document.getElementById("bbs_s26").style.display="none";
 break;
       case 20:
document.getElementById("bbs_s1").style.display="none";
document.getElementById("bbs_s2").style.display="none";
document.getElementById("bbs_s3").style.display="none";
document.getElementById("bbs_s4").style.display="none";
document.getElementById("bbs_s5").style.display="none";
document.getElementById("bbs_s6").style.display="none";
document.getElementById("bbs_s7").style.display="none";
document.getElementById("bbs_s8").style.display="none";
document.getElementById("bbs_s9").style.display="none";
document.getElementById("bbs_s10").style.display="none";
document.getElementById("bbs_s11").style.display="none";
document.getElementById("bbs_s12").style.display="none";
document.getElementById("bbs_s13").style.display="none";
document.getElementById("bbs_s14").style.display="none";
document.getElementById("bbs_s15").style.display="none";
document.getElementById("bbs_s16").style.display="none";
document.getElementById("bbs_s17").style.display="none";
document.getElementById("bbs_s18").style.display="none";
document.getElementById("bbs_s19").style.display="none";
document.getElementById("bbs_s20").style.display="block";
document.getElementById("bbs_s21").style.display="none";
document.getElementById("bbs_s22").style.display="none";
document.getElementById("bbs_s23").style.display="none";
document.getElementById("bbs_s24").style.display="none";
document.getElementById("bbs_s25").style.display="none";
document.getElementById("bbs_s26").style.display="none";
 break;
       case 21:
document.getElementById("bbs_s1").style.display="none";
document.getElementById("bbs_s2").style.display="none";
document.getElementById("bbs_s3").style.display="none";
document.getElementById("bbs_s4").style.display="none";
document.getElementById("bbs_s5").style.display="none";
document.getElementById("bbs_s6").style.display="none";
document.getElementById("bbs_s7").style.display="none";
document.getElementById("bbs_s8").style.display="none";
document.getElementById("bbs_s9").style.display="none";
document.getElementById("bbs_s10").style.display="none";
document.getElementById("bbs_s11").style.display="none";
document.getElementById("bbs_s12").style.display="none";
document.getElementById("bbs_s13").style.display="none";
document.getElementById("bbs_s14").style.display="none";
document.getElementById("bbs_s15").style.display="none";
document.getElementById("bbs_s16").style.display="none";
document.getElementById("bbs_s17").style.display="none";
document.getElementById("bbs_s18").style.display="none";
document.getElementById("bbs_s19").style.display="none";
document.getElementById("bbs_s20").style.display="none";
document.getElementById("bbs_s21").style.display="block";
document.getElementById("bbs_s22").style.display="none";
document.getElementById("bbs_s23").style.display="none";
document.getElementById("bbs_s24").style.display="none";
document.getElementById("bbs_s25").style.display="none";
document.getElementById("bbs_s26").style.display="none";
 break;
       case 22:
document.getElementById("bbs_s1").style.display="none";
document.getElementById("bbs_s2").style.display="none";
document.getElementById("bbs_s3").style.display="none";
document.getElementById("bbs_s4").style.display="none";
document.getElementById("bbs_s5").style.display="none";
document.getElementById("bbs_s6").style.display="none";
document.getElementById("bbs_s7").style.display="none";
document.getElementById("bbs_s8").style.display="none";
document.getElementById("bbs_s9").style.display="none";
document.getElementById("bbs_s10").style.display="none";
document.getElementById("bbs_s11").style.display="none";
document.getElementById("bbs_s12").style.display="none";
document.getElementById("bbs_s13").style.display="none";
document.getElementById("bbs_s14").style.display="none";
document.getElementById("bbs_s15").style.display="none";
document.getElementById("bbs_s16").style.display="none";
document.getElementById("bbs_s17").style.display="none";
document.getElementById("bbs_s18").style.display="none";
document.getElementById("bbs_s19").style.display="none";
document.getElementById("bbs_s20").style.display="none";
document.getElementById("bbs_s21").style.display="none";
document.getElementById("bbs_s22").style.display="block";
document.getElementById("bbs_s23").style.display="none";
document.getElementById("bbs_s24").style.display="none";
document.getElementById("bbs_s25").style.display="none";
document.getElementById("bbs_s26").style.display="none";
 break;
       case 23:
document.getElementById("bbs_s1").style.display="none";
document.getElementById("bbs_s2").style.display="none";
document.getElementById("bbs_s3").style.display="none";
document.getElementById("bbs_s4").style.display="none";
document.getElementById("bbs_s5").style.display="none";
document.getElementById("bbs_s6").style.display="none";
document.getElementById("bbs_s7").style.display="none";
document.getElementById("bbs_s8").style.display="none";
document.getElementById("bbs_s9").style.display="none";
document.getElementById("bbs_s10").style.display="none";
document.getElementById("bbs_s11").style.display="none";
document.getElementById("bbs_s12").style.display="none";
document.getElementById("bbs_s13").style.display="none";
document.getElementById("bbs_s14").style.display="none";
document.getElementById("bbs_s15").style.display="none";
document.getElementById("bbs_s16").style.display="none";
document.getElementById("bbs_s17").style.display="none";
document.getElementById("bbs_s18").style.display="none";
document.getElementById("bbs_s19").style.display="none";
document.getElementById("bbs_s20").style.display="none";
document.getElementById("bbs_s21").style.display="none";
document.getElementById("bbs_s22").style.display="none";
document.getElementById("bbs_s23").style.display="block";
document.getElementById("bbs_s24").style.display="none";
document.getElementById("bbs_s25").style.display="none";
document.getElementById("bbs_s26").style.display="none";
 break;
       case 24:
document.getElementById("bbs_s1").style.display="none";
document.getElementById("bbs_s2").style.display="none";
document.getElementById("bbs_s3").style.display="none";
document.getElementById("bbs_s4").style.display="none";
document.getElementById("bbs_s5").style.display="none";
document.getElementById("bbs_s6").style.display="none";
document.getElementById("bbs_s7").style.display="none";
document.getElementById("bbs_s8").style.display="none";
document.getElementById("bbs_s9").style.display="none";
document.getElementById("bbs_s10").style.display="none";
document.getElementById("bbs_s11").style.display="none";
document.getElementById("bbs_s12").style.display="none";
document.getElementById("bbs_s13").style.display="none";
document.getElementById("bbs_s14").style.display="none";
document.getElementById("bbs_s15").style.display="none";
document.getElementById("bbs_s16").style.display="none";
document.getElementById("bbs_s17").style.display="none";
document.getElementById("bbs_s18").style.display="none";
document.getElementById("bbs_s19").style.display="none";
document.getElementById("bbs_s20").style.display="none";
document.getElementById("bbs_s21").style.display="none";
document.getElementById("bbs_s22").style.display="none";
document.getElementById("bbs_s23").style.display="none";
document.getElementById("bbs_s24").style.display="block";
document.getElementById("bbs_s25").style.display="none";
document.getElementById("bbs_s26").style.display="none";
 break;
       case 25:
document.getElementById("bbs_s1").style.display="none";
document.getElementById("bbs_s2").style.display="none";
document.getElementById("bbs_s3").style.display="none";
document.getElementById("bbs_s4").style.display="none";
document.getElementById("bbs_s5").style.display="none";
document.getElementById("bbs_s6").style.display="none";
document.getElementById("bbs_s7").style.display="none";
document.getElementById("bbs_s8").style.display="none";
document.getElementById("bbs_s9").style.display="none";
document.getElementById("bbs_s10").style.display="none";
document.getElementById("bbs_s11").style.display="none";
document.getElementById("bbs_s12").style.display="none";
document.getElementById("bbs_s13").style.display="none";
document.getElementById("bbs_s14").style.display="none";
document.getElementById("bbs_s15").style.display="none";
document.getElementById("bbs_s16").style.display="none";
document.getElementById("bbs_s17").style.display="none";
document.getElementById("bbs_s18").style.display="none";
document.getElementById("bbs_s19").style.display="none";
document.getElementById("bbs_s20").style.display="none";
document.getElementById("bbs_s21").style.display="none";
document.getElementById("bbs_s22").style.display="none";
document.getElementById("bbs_s23").style.display="none";
document.getElementById("bbs_s24").style.display="none";
document.getElementById("bbs_s25").style.display="block";
document.getElementById("bbs_s26").style.display="none";
 break;
       case 26:
document.getElementById("bbs_s1").style.display="none";
document.getElementById("bbs_s2").style.display="none";
document.getElementById("bbs_s3").style.display="none";
document.getElementById("bbs_s4").style.display="none";
document.getElementById("bbs_s5").style.display="none";
document.getElementById("bbs_s6").style.display="none";
document.getElementById("bbs_s7").style.display="none";
document.getElementById("bbs_s8").style.display="none";
document.getElementById("bbs_s9").style.display="none";
document.getElementById("bbs_s10").style.display="none";
document.getElementById("bbs_s11").style.display="none";
document.getElementById("bbs_s12").style.display="none";
document.getElementById("bbs_s13").style.display="none";
document.getElementById("bbs_s14").style.display="none";
document.getElementById("bbs_s15").style.display="none";
document.getElementById("bbs_s16").style.display="none";
document.getElementById("bbs_s17").style.display="none";
document.getElementById("bbs_s18").style.display="none";
document.getElementById("bbs_s19").style.display="none";
document.getElementById("bbs_s20").style.display="none";
document.getElementById("bbs_s21").style.display="none";
document.getElementById("bbs_s22").style.display="none";
document.getElementById("bbs_s23").style.display="none";
document.getElementById("bbs_s24").style.display="none";
document.getElementById("bbs_s25").style.display="none";
document.getElementById("bbs_s26").style.display="block";
 break;
 }
}