!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" 
"http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
html xmlns="http://www.w3.org/1999/xhtml">
head>
meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
title>Ajax加载外部页面的一个弹出层效果/title>
style>
body {margin:0px}
#Loading {position:absolute;z-index:10;left:10px;top:10px;border:1px #666666 solid;background:#eeeeee;width:10px;height:10px}
.LoadContent {width:100%;height:100%;overflow:auto}
/style>
script LANGUAGE="JavaScript"> 
!-- 
function $(){return document.getElementById?document.getElementById(arguments[0]):eval(arguments[0]);}
var OverH,OverW,ChangeDesc,ChangeH=50,ChangeW=50;
function OpenDiv(_Dw,_Dh,_Desc) {
$("Loading").innerHTML="Loading...";
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";
$("Loading").style.top=(document.documentElement.clientHeight-Nh)/2+"px"
}
window.setTimeout("OpenNow()",10)
}else{
Nw=10;Nh=10;ChangeH=50;ChangeW=50;
AjaxGet(ChangeDesc)
}
}
//创建XML对象
function createXMLHttps(){
var ret = null;
try {ret = new ActiveXObject('Msxml2.XMLHTTP')}
catch (e) {
try {ret = new ActiveXObject('Microsoft.XMLHTTP')}
catch (ee) {ret = null}
}
if (!rettypeof XMLHttpRequest !='undefined') ret = new XMLHttpRequest();
return ret;
}
function AjaxGet(URL) {
var xmlhttp = createXMLHttps();
xmlhttp.open("Get",URL,true);
xmlhttp.setRequestHeader("Content-Type", "application/x-www-form-urlencoded");
xmlhttp.onreadystatechange = function() {
if (xmlhttp.readyState == 4  xmlhttp.status==404) {$("Loading").innerHTML='读取页面失败,文件'+URL+'不存在!';return}
if (xmlhttp.readyState == 4  xmlhttp.status == 200) {
$("Loading").innerHTML="div class='LoadContent'>"+xmlhttp.responseText+"/div>";
}
}
xmlhttp.send(null);
}
//-->
/script> 
/head>
body>
a href="javascript:OpenDiv(500,300,'index.html')">首页 500*300/a>br>br>
a href="javascript:OpenDiv(500,200,'index.html')">Test 500*200/a>br>br>
a href="javascript:OpenDiv(200,500,'l.html')">子页面 200*500/a>br>br>
div id="Loading" style="display:none" ondblclick="this.style.display='none'">/div>
注意：需加载的文件必须在子目录下，也就是本文件需处于上级才行。页面编码UTF8。
/body>
/html>