<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<script language="javascript" type="text/javascript" src="jquery-1.5.1.js"></script>
<title>无标题文档</title>

</head>
<style type="text/css">
body{ padding:0px; margin:0px;}
.flll{
	position:absolute;
	top:0px;
	left:0px;
	width:100%;
	height:100%;
	filter: Alpha(Opacity=70);
	Opacity=0.7;
	background-color:#000;
	display:none;
}
</style>
<body>
<a href="#" id="111">点击 弹出</a>

<div class="flll">
<a href="feedback/">欢迎来到jquery世界</a>
</div>
<form id="form1" name="form1" method="post" action="">
  <label>
    <textarea name="textarea" id="textarea" cols="45" rows="5">fdsfdssw
    </textarea>
  </label>
</form>
<script language="javascript">
mask = $(".flll");
		$("#111").click(function(){
				mask.show();
		});
		//mask.mousedown(function(){alert("123");});
		//mask.click(function(){mask.hide();});
</script>
</body>
</html>