<body style="height:100%;">
-------------------------------------------------------------------一开始的页面----------------------
fdasfsdfadf
<input name="button2" onclick="ShopConfirm('fdsaf')" value="点我" type="button"/>
----------------------------------------------------------点击后出现的覆盖显示的内容-------------------
<!--内容层-->
<div id="ShopConfirmLayer" style="position:absolute;top:300px;left:100px;z-index:900;border:1px red solid;width:500px;display:none;">
这是我点击后出现的内容
<input name="button1" value="关闭" type="button" onclick="CloseShopConfirm()"/>
</div>
------------------------------------------------------------------覆盖的页面-------------------
<!--覆盖层-->
<div id="webBgLayer" style="position:absolute;top:0px;left:0px;z-index:899;background-color:#ccc;height:100%;width:100%;display:none;-moz-opacity:0.9;filter:alpha(opacity=50);"></div>
-------------------这里;-moz-opacity:0.9;filter:alpha(opacity=50）很关键/*透明滤镜50%*/ }
<script type="text/javascript">
function ShopConfirm(str){
var ShopConfirmLayer=document.getElementById("ShopConfirmLayer");
var webBgLayer=document.getElementById("webBgLayer");
// ShopConfirmLayer.innerHTML=str;
ShopConfirmLayer.style.display="";//显示内容层，显示覆盖层
ShopConfirmLayer.style.left=parseInt((document.documentElement.scrollWidth-ShopConfirmLayer.offsetWidth)/2)+document.documentElement.scrollLeft+"px";
ShopConfirmLayer.style.top=Math.abs(parseInt((document.documentElement.clientHeight-Sho
