jQuery实现可兼容IE6的遮罩功能实例分享

<p id="main"><a onclick="showBg();" href="#" rel="external nofollow" rel="external nofollow" >点击这里看 jQuery 遮罩层效果.</a></p>
<p id="fullbg"></p>
<p id="dialog">
<p class="close"><a onclick="closeBg();" href="#" rel="external nofollow" rel="external nofollow" >关闭</a></p>
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</p>

body {
 font-family: Arial, Helvetica, sans-serif;
 font-size: 12px;
 margin: 0;
}
#main {
 height: 1800px;
 padding-top: 90px;
 text-align: center;
}
#fullbg {
 background-color: Gray;
 left: 0px;
 opacity: 0.5;
 position: absolute;
 top: 0px;
 z-index: 3;
 filter: alpha(opacity=50); /* IE6 */
 -moz-opacity: 0.5; /* Mozilla */
 -khtml-opacity: 0.5; /* Safari */
}
#dialog {
 background-color: #FFF;
 border: 1px solid #888;
 display: none;
 height: 200px;
 left: 50%;
 margin: -100px 0 0 -100px;
 padding: 12px;
 position: fixed !important; /* 浮动对话框 */
 position: absolute;
 top: 50%;
 width: 200px;
 z-index: 5;
}
#dialog p {
 margin: 0 0 12px;
}
#dialog p.close {
 text-align: right;
}