层的显示/隐藏代码

<SCRIPT language="javascript">

function changediv(id) { 
 var a= new Array();
 
 a[0] = document.getElementById("Layer1");
 a[1] = document.getElementById("Layer2");
 a[2] = document.getElementById("Layer3");
 a[3] = document.getElementById("Layer4");

 for(i=0; i<a.length; i++){
  var e = a[i];
  e.style.visibility="hidden";
  e.style.display="none";
 }
 
 var e = a[id-1];
 e.style.display="block";
 e.style.visibility="visible";
}

</SCRIPT>

链接代码：<a href="javascript:void()" onClick="changediv(1)">

层的属性代码：<DIV id=Layer1 style="display:block; visibility:visible">

                           <DIV id=Layer2 style=" display:none; visibility:hidden">