img.js

除过搜索外

var nn;
nn=1;
setTimeout('change_img12()',5000);
function change_img12()
{
 if(nn>4) nn=1
 setTimeout('setFocus12('+nn+')',5000);
 nn++;
 tt=setTimeout('change_img12()',5000);
}
function setFocus12(i)
{
 selectLayer12(i);
}
function selectLayer12(num)
{
 for(var id = 1;id<=4;id++)
 {
  var ss="focusPic"+id;
  if(id==num)
  document.getElementById(ss).style.display="block";
  else
  document.getElementById(ss).style.display="none";
 }  
}