半透明遮盖区域（层高级应用）

<script language=javascript> function moduleZone(id,show)
{
var s=(show==true)?"hidden":"visible";
//alert(s);
document.write(" <div id=moduleZone_" id " style=position:absolute;width:100%;visibility:" s ";> <table style='width:100%;' border='0' cellspacing='0' cellpadding='0'> <tr valign=middle> <td> <iframe src='about:blank' frameborder='0' style="position:relative; visibility:" s "; width:100%;filter='progid:DXImageTransform.Microsoft.Alpha(style=0,opacity=50)';"></iframe> <table style='width:100%' border='0' cellspacing='0' cellpadding='0'> <tr> </tr> </table> <iframe src='about:blank' frameborder='0' style="position:relative; visibility:inherit;width:100%;filter='progid:DXImageTransform.Microsoft.Alpha(style=0,opacity=50)';"></iframe> </td> </tr> </table> </div>");
}
</script> 说明: id:层的名称; show是否显示该区域 例 <span style="width:100%; <script language=javascript> moduleZone("id",false)
</script> lkalsdf asdf asf asf </span>
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