//图层切换

var last=new Array();
function ChangeDiv(divId,divName,zDivCount,obj) 
{ 
 for(i=0;i<=zDivCount;i++)
 {
     document.getElementById(divName+i).style.display="none"; 
 }
 document.getElementById(divName+divId).style.display="block"; 
if(!last[divName])last[divName]=document.getElementById(divName+"DEF");
last[divName].className="";
last[divName]=obj;
last[divName].className="Selected";
}