[参与测试的浏览器：IE6 / IE7 / IE8 / FF3.5 / OP9.6 / SF4 / Chrome2 ]
[操作系统：Windows]
本教程旨在实现lightBox时的样式与行为分离，减少JS在各方面（全屏遮蔽、ie6中遮蔽select、双向居中、高度自适应内容等）的工作。
先上代码：
代码如下:
<!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" />
<meta name="author" content="Chomo" />
<link rel="start" href="http://www.14px.com" title="Home" />
<title>全屏屏蔽、自动居中的lightBox</title>
<style type="text/css">
* { margin:0; padding:0; }
html,body { height:100%; overflow:hidden; font:12px/1.5 simsun;}
.myPage { line-height:3; overflow:auto; width:100%; height:100%;}
.lightBox,
.popupCover,
.popupIframe,
.popupComponent { position:absolute; left:0; top:0; width:100%; height:100%;}
.popupComponent { z-index:2; display:none;}
.popupIframe { display:none; _display:block; _filter:alpha(opacity=0);}
.popupCover { background:#000; opacity:0.7; *filter:alpha(opacity=70);}
.lightBox { text-align:center; overflow:auto;}
.lightBoxContent { display:inline-block; *display:inline; zoom:1; width:300px; padding:10px; background:#fff; border:5px solid #00b4ff; vertical-align:middle;}
.lightBoxMaxHeight { display:inline-block; vertical-align:middle; height:100%; *height:99.5%; width:1px; overflow:hidden; margin-left:-1px;}
.lightBoxWrapper { display:inline-block; *display:inline; zoom:1; text-align:left;}
.lightBoxClose { color:#f00;}
.lightBoxSubmit { margin-top:10px; padding-top:5px; border-top:1px solid #ccc;}
.lightBoxSubmit input { font-size:12px; padding:0 10px; overflow:visible; margin:0 5px;}
</style>
</head>
<body>
<div class="popupComponent" id="lightBox">
<iframe class="popupIframe"></iframe>
<div class="popupCover"></div>
<div class="lightBox">
<span class="lightBoxMaxHeight"></span>
<div class="lightBoxContent">
<div class="lightBoxWrapper">
当提示小于一行时文字居中[br]
</div>
<div class="lightBoxSubmit">
<input type="button" value="确定" onclick="hideLayer('lightBox')" />
<input type="button" value="取消" onclick="hideLayer('lightBox')" />
</div>
</div>
</div>
</div>
<div class="popupComponent" id="lightBox2">
<iframe class="popupIframe"></iframe>
<div class="popupCover"></div>
<div class="lightBox">
<div class="lightBoxContent">
<div class="lightBoxWrapper">
当内容已经超过了一屏的高度 当内容已经超过了一屏的高度 当内容已经超过了一屏的高度 当内容已经超过了一屏的高度[br]
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