弹出层

<style>
#Loading {position:absolute;z-index:10;left:10px;top:10px;border:1px #666666 solid;background:#eeeeee;width:10px;height:10px}
</style>
<script LANGUAGE="JavaScript">
<!--
function $(){return document.getElementById?document.getElementById(arguments[0]):eval(arguments[0]);}
var OverH,OverW,ChangeDesc,ChangeH=50,ChangeW=50;
// 调用方式(OpenDiv(500,300,'双击可以关闭'))  <div id="Loading" style="display:none" ondblclick="this.style.display='none'"></div>
function OpenDiv(_Dw,_Dh,_Desc) {
 $("Loading").innerHTML="";
 OverH=_Dh;OverW=_Dw;ChangeDesc=_Desc;
 $("Loading").style.display='';
 if(_Dw>_Dh){ChangeH=Math.ceil((_Dh-10)/((_Dw-10)/50))}else if(_Dw<_Dh){ChangeW=Math.ceil((_Dw-10)/((_Dh-10)/50))}
 $("Loading").style.top=(document.documentElement.clientHeight-10)/2+"px";
 $("Loading").style.left=(document.documentElement.clientWidth-10)/2+"px";
 OpenNow();
}
var Nw=10,Nh=10;
function OpenNow() {
 if (Nw>OverW-ChangeW)ChangeW=2;
 if (Nh>OverH-ChangeH)ChangeH=2;
 Nw=Nw+ChangeW;Nh=Nh+ChangeH;
 
 if(OverW>Nw||OverH>Nh) {
  if(OverW>Nw) {
   $("Loading").style.width=Nw+"px";
   $("Loading").style.left=(document.documentElement.clientWidth-Nw)/2+"px";
  }
  if(OverH>Nh) {
   $("Loading").style.height=Nh+"px";
   $("Loading").style.top=(document.documentElement.clientHeight-Nh)/2+"px"
  }
  window.setTimeout("OpenNow()",10)
  }else{
   Nw=10;Nh=10;ChangeH=50;ChangeW=50;
   $("Loading").innerHTML=ChangeDesc;
  }
}
//-->
</script>

 

<div id="Loading" style="display:none" ondblclick="this.style.display='none'"></div>

<input type="button" onclick="OpenDiv(500,300,'双击可以关闭')" value="弹出层"/>