// JScript 文件

function changeTab(id,classname)
{
   document.getElementById("tab1").className="box_top_left2";
   document.getElementById("tab2").className="box_top_left2";
   document.getElementById("tab3").className="box_top_left2";
   document.getElementById("tab4").className="box_top_left2";
   document.getElementById("tab"+id).className=classname;
   changeDiv(id,classname);
}
function changeDiv(id,classname)
{
   document.getElementById("tab_layer1").style.display="none";
   document.getElementById("tab_layer2").style.display="none";
   document.getElementById("tab_layer3").style.display="none";
   document.getElementById("tab_layer4").style.display="none";
   document.getElementById("tab_layer"+id).style.display="block";
}
function changeBackImage(id)
{
   document.getElementById("list1").style.backgroundImage="url('')";
   document.getElementById("list2").style.backgroundImage="url('')";
   document.getElementById("list"+id).style.backgroundImage="url(image/QQOnline.jpg)";
}