var tt;
function setFocus(i)
{
 if(tt) clearTimeout(tt);
 nn = i;
 selectLayer1(i);
 tt=setTimeout('0');
}
function selectLayer1(i)
{
 switch(i)
 {
 case 1:
document.getElementById("tab1").style.display="block";
document.getElementById("tab2").style.display="none";
document.getElementById("tab3").style.display="none";
 break;
case 2:
document.getElementById("tab1").style.display="none";
document.getElementById("tab2").style.display="block";
document.getElementById("tab3").style.display="none";
 break;
 case 3:
document.getElementById("tab1").style.display="none";
document.getElementById("tab2").style.display="none";
document.getElementById("tab3").style.display="block";
 break; 
case 5:
document.getElementById("tab5").style.display="block";
document.getElementById("tab6").style.display="none";
document.getElementById("tab7").style.display="none";
document.getElementById("tab8").style.display="none";
document.getElementById("tab9").style.display="none";

 break;
  case 6:
document.getElementById("tab5").style.display="none";
document.getElementById("tab6").style.display="block";
document.getElementById("tab7").style.display="none";
document.getElementById("tab8").style.display="none";
document.getElementById("tab9").style.display="none";

 break;
  case 7:
document.getElementById("tab5").style.display="none";
document.getElementById("tab6").style.display="none";
document.getElementById("tab7").style.display="block";
document.getElementById("tab8").style.display="none";
document.getElementById("tab9").style.display="none";

 break;
  case 8:
document.getElementById("tab5").style.display="none";
document.getElementById("tab6").style.display="none";
document.getElementById("tab7").style.display="none";
document.getElementById("tab8").style.display="block";
document.getElementById("tab9").style.display="none";

 break;
  case 9:
document.getElementById("tab5").style.display="none";
document.getElementById("tab6").style.display="none";
document.getElementById("tab7").style.display="none";
document.getElementById("tab8").style.display="none";
document.getElementById("tab9").style.display="block";

 break;
 
 }
}