// JavaScript Document
var nn;
nn=1;
setTimeout('change_img()',2000);
function change_img()
{
 if(nn>4) nn=1
 setTimeout('setFocus1('+nn+')',2000);
 nn++;
 tt=setTimeout('change_img()',2000);
}
function setFocus1(i)
{
 selectLayer1(i);
}
function selectLayer1(i)
{
 switch(i)
 {
 case 1:
 document.getElementById("yt1").style.display="block";
 document.getElementById("yt2").style.display="none";
 document.getElementById("yt3").style.display="none";
 document.getElementById("yt4").style.display="none";
 document.getElementById("yt5").style.display="none";
 document.getElementById("yt6").style.display="none";
 break;
 case 2:
 document.getElementById("yt1").style.display="none";
 document.getElementById("yt2").style.display="block";
 document.getElementById("yt3").style.display="none";
 document.getElementById("yt4").style.display="none";
 document.getElementById("yt5").style.display="none";
 document.getElementById("yt6").style.display="none";
 break;
 case 3:
 document.getElementById("yt1").style.display="none";
 document.getElementById("yt2").style.display="none";
 document.getElementById("yt3").style.display="block";
 document.getElementById("yt4").style.display="none";
 document.getElementById("yt5").style.display="none";
 document.getElementById("yt6").style.display="none";
 break;
 case 4:
 document.getElementById("yt1").style.display="none";
 document.getElementById("yt2").style.display="none";
 document.getElementById("yt3").style.display="none";
 document.getElementById("yt4").style.display="block";
 document.getElementById("yt5").style.display="none";
 document.getElementById("yt6").style.display="none";
 break;
 case 5:
 document.getElementById("yt1").style.display="none";
 document.getElementById("yt2").style.display="none";
 document.getElementById("yt3").style.display="none";
 document.getElementById("yt4").style.display="none";
 document.getElementById("yt5").style.display="block";
 document.getElementById("yt6").style.display="none";
 break;
 case 6:
 document.getElementById("yt1").style.display="none";
 document.getElementById("yt2").style.display="none";
 document.getElementById("yt3").style.display="none";
 document.getElementById("yt4").style.display="none";
 document.getElementById("yt5").style.display="none";
 document.getElementById("yt6").style.display="block";
 break;
 
 }
}