当不能运用框架的弹出层时，自定义简单的弹出层！
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title></title>
<head>
<title>弹出层</title>
<script src="jquery-1.6.2.min.js" type="text/javascript"></script>
<style>
.black_overlay {
display: none;
position: absolute;
top: 0%;
left: 0%;
100%;
height: 100%;
background-color: #ccc;
z-index: 1001;
-moz-opacity: 0.5;
opacity: .50;
filter: alpha(opacity=80);
}
.white_content {
display: none;
position: absolute;
top: 25%;
left: 25%;
50%;
height: 40%;
border: 2px solid #ff6600;
background-color: white;
z-index: 1002;
overflow: auto;
}
</style>
<script type="text/javascript">
//弹出隐藏层
function ShowDiv(show_div, bg_div) {
document.getElementById(show_div).style.display = 'block';
document.getElementById(bg_div).style.display = 'block';
var bgdiv = document.getElementById(bg_div);
bgdiv.style.width = document.body.scrollWidth;
// bgdiv.style.height = $(document).height();
$("#" + bg_div).height($(document).height());
};
//关闭弹出层
function CloseDiv(show_div, bg_div) {
document.getElementById(show_div).style.display = 'none';
document.getElementById(bg_div).style.display = 'none';
};
</script>
</head>
<body>
<input id="Button1" type="button" value="请点击" onclick="ShowDiv('MyDiv','fade')" />
<!--弹出层时背景层DIV-->
<div id="fade" class="black_overlay">
</div>
<div id="MyDiv" class="white_content">
<div style="text-align: right; cursor: default; height: 20px;">
<span style="font-size: 16px;" onclick="CloseDiv('MyDiv','fade')">关闭</span>
</div>
有时需要自己做弹出层！！！
</div>
</body>
</html>