遮罩层div

<html>
<head>
<script src="http://common.cnblogs.com/script/jquery.js" type="text/javascript"></script>
<script type="text/javascript">
        function ShowDialog() {
            $('#divGray').css('height', $(document).height());
            $('#divGray').show();
            
            $('#divEdit').css('top', $(document).scrollTop() + 80);
            $('#divEdit').css('left', ($(document).width() - 500) / 2);
            $('#divEdit').show();

            $('#divShadow').css('top', $('#divEdit').offset().top + 5);
            $('#divShadow').css('left', $('#divEdit').offset().left + 5);
            $('#divShadow').css('width', $('#divEdit').width());
            $('#divShadow').css('height', $('#divEdit').height());
            $('#divShadow').show();
        }
        
        function CancelDialog() {
            $('#divGray').hide();
            $('#divEdit').hide();
            $('#divEdit input:text').val('');
            $('#divShadow').hide();
        }
</script>
<style type="text/css">
#divEdit {
    position: absolute;
    z-index: 10003;
    width: 480px;
    border-top: #709cd2 1px solid;
    border-left: #709cd2 1px solid;
    border-right: #709cd2 1px solid;
    border-bottom: #709cd2 1px solid;
    display: none;
}
#divGray {
    position: absolute;
    z-index: 10001;
    left: 0px;    
    top: 0px;
    width: 100%;
    background-color: #EEEFFF;
    opacity: 0.6;                /* Firefox, Safari(WebKit), Opera)
    filter: "alpha(opacity=60)"; /* IE 8 */
    filter: alpha(opacity=60);   /* IE 4-7 */
    display: none;
}
#divShadow {
    position: absolute;
    z-index: 10002;
    background: #000EEE;
    opacity: 0.1;                /* Firefox, Safari(WebKit), Opera)
    filter: "alpha(opacity=10)"; /* IE 8 */
    filter: alpha(opacity=10);   /* IE 4-7 */
    display: none;
}
</style>
</head>
<body>
<input  type="button" style="height: 30px; width: 100px;" onClick="ShowDialog()" value="cover" />
<br/><br/><br/><br/><br/><br/><br/><br/><br/><br/><br/><br/><br/><br/><br/><br/><br/><br/><br/><br/><br/>
<br/><br/><br/><br/><br/><br/><br/><br/><br/><br/><br/><br/><br/><br/><br/><br/><br/><br/><br/><br/><br/>
<br/><br/><br/><br/><br/><br/><br/><br/><br/><br/><br/><br/><br/><br/><br/><br/><br/><br/><br/><br/><br/>
<input type="button" value="test" />

<div id="divEdit">
        abcd
        <br/><br/><br/><br/><br/><br/><br/><br/><br/><br/><br/><br/><br/><br/><br/><br/><br/><br/><br/><br/><br/>
        <input type="button" value="cancel" onClick="CancelDialog()"/>
</div>
<div id="divGray"></div><div id="divShadow"></div>
</body>
</html>

It is ok Html code.

<html>
<head>
<script src="http://common.cnblogs.com/script/jquery.js" type="text/javascript"></script>
<script type="text/javascript">
        function ShowDialog() {
            $('#divGray').css('height', $(document).height());
            $('#divGray').show();
            
            $('#divEdit').css('top', $(document).scrollTop() + 200);
            $('#divEdit').css('left', ($(document).width() - 500) / 2);
            $('#divEdit').show();

            $('#divShadow').css('top', $('#divEdit').offset().top + 5);
            $('#divShadow').css('left', $('#divEdit').offset().left + 5);
            $('#divShadow').css('width', $('#divEdit').width());
            $('#divShadow').css('height', $('#divEdit').height());
            $('#divShadow').show();
        }
        
        function CancelDialog() {
            $('#divGray').hide();
            $('#divEdit').hide();
            $('#divEdit input:text').val('');
            $('#divShadow').hide();
        }
</script>
<style type="text/css">
#divEdit {
    position: absolute;
    z-index: 10003;
    width: 480px;
 
    
    background-color: #FFFFF;
    background: #FFFFF;
    display: none;
}
#divGray {
    position: absolute;
    z-index: 10001;
    left: 0px;    
    top: 0px;
    width: 100%;
    background-color: #000000;
    opacity: 0;                /* Firefox, Safari(WebKit), Opera)
    filter: "alpha(opacity=40)"; /* IE 8 */
    filter: alpha(opacity=40);   /* IE 4-7 */
    display: none;
}
#divShadow {
    position: absolute;
    z-index: 10002;
    background: #FFFFFF;

    display: none;
}
</style>
</head>
<body>
<input  type="button" style="height: 30px; width: 100px;" onClick="ShowDialog()" value="cover" />
<br/><br/><br/><br/><br/><br/><br/><br/><br/><br/><br/><br/><br/><br/><br/><br/><br/><br/><br/><br/><br/>
<br/><br/><br/><br/><br/><br/><br/><br/><br/><br/><br/><br/><br/><br/><br/><br/><br/><br/><br/><br/><br/>
<br/><br/><br/><br/><br/><br/><br/><br/><br/><br/><br/><br/><br/><br/><br/><br/><br/><br/><br/><br/><br/>
<input type="button" value="test" />

<div id="divEdit">
        abcd
        <br/><br/><br/><br/><br/><br/><br/><br/><br/><br/><br/><br/><br/><br/><br/><br/><br/><br/><br/><br/><br/>
        <input type="button" value="cancel" onClick="CancelDialog()"/>
</div>
<div id="divGray"></div><div id="divShadow"></div>
</body>
</html>

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