<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/htmlcharset=gb2312" />
<script>
function turnoff(obj){
document.getElementById(obj).style.display="none"
}
</script>
<script type="text/javascript" src="jquery-1.5.1.min.js"></script>
<style type="text/css">
.mydiv
{
text-align: centerfont-size: 9ptz-index: 99width:500pxheight:300pxleft: 50%top: 50%
margin-left: -250px !importantmargin-top: -150px !importantmargin-top: 0pxposition: fixed !important
position: absolute
_top: expression(eval(document.compatMode &&
document.compatMode=='CSS1Compat') ?
documentElement.scrollTop + (document.documentElement.clientHeight-this.offsetHeight)/2 :/*IE6*/
document.body.scrollTop + (document.body.clientHeight - this.clientHeight)/2)/*IE5 IE5.5*/
}
.bg
{
background-color: #000000
width: 100%
height: 100%
left: 0
top: 0
filter: alpha(opacity=50)
opacity: 0.5
z-index: 1
position: fixed !important/*FF IE7*/
position: absolute
_top: expression(eval(document.compatMode &&document.compatMode=='CSS1Compat') ?
documentElement.scrollTop + (document.documentElement.clientHeight-this.offsetHeight)/2 :/*IE6*/
document.body.scrollTop + (document.body.clientHeight - this.clientHeight)/2)/*IE5 IE5.5*/
}
</style>
<script language="javascript" type="text/javascript">
var Itemindex = 0
function showDiv() {
document.getElementById('popDiv').style.display = 'block'
document.getElementById('bg').style.display = 'block'
}
function closeDiv() {
document.getElementById('popDiv').style.display = 'none'
document.getElementById('bg').style.display = 'none'
}
window.onload=function(){showDiv()}
</script>
</head>
<body>
<div onclick="showDiv()" style="display:blockcursor:pointer">
div#showDiv
</div>
<div id="popDiv" class="mydiv" style="display: none">
<div id="Prompt">
<div id="Close"><a href="#" onclick="closeDiv()" style="display:blockcursor:pointer"><strong>返回</strong></a></div>
<div id="qian"></div>
<div class="zhuliutishi" id="text">div#zhuliutishi</div>
</div>
</div>
<div id="bg" class="bg" style="display: none">
</div>
</body>
</html>
你说的是ie的插件，肯定没有用的ff下可以用遮罩。。或者js
<script src="grayscale.js" type="text/javascript"></script>
<script type="text/javascript">
window.onload=function(){ //网页变灰
grayscale(document.body)
}
</script>
grayscale.js，你网上搜一下吧
msg 为DIV id ；text 为 你要抓取的id 比如 文本的等；
要自己做个事件触发此方法；
function refer(){
var textValue = document.getElementById("text")
if(textValue.value == ""){
document.getElementById("msg").style.display ="none"
}
else{
document.getElementById("msg").style.display =""
}
}
