不好意思，刚刚发了一个类似的效果，发现代码比较多，而却还有一个bug，现在修正了，特出代码：
<!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 runat="server">
<title></title>
<script type="text/javascript" src="../Javascript/jquery-1.6.js"></script>
<style type="text/css">
#choice_list_district{ height:50px;}
#tab td{cursor:pointer;}
</style>
<script type="text/javascript">
$(function () {
//绑定事件处理
$("#choice_list_district a").click(function (e) {
if ($("#divObj").css("display") == "none") {
e.stopPropagation();
//设置弹出层位置
var offset = $(e.target).offset();
//设置弹出层位置在点击的下面
$("#divObj").css({ top: offset.top + $(e.target).height() + "px", left: offset.left });
$("#divObj").show();
}
else {
$("#divObj").hide();
}
});
//单击空白区域隐藏弹出层
$(document).click(function (event) { $("#divObj").hide(); });
//单击弹出层则自身隐藏
//$("#divObj").click(function (event) { $("#divObj").hide(speed) });
$("#tab tr td").click(function (event) {
$("#aaa").val($(this).html());
});
});
</script>
</head>
<body>
<form id="form1" runat="server">
<div>
<div id="choice_list_district">
<a href="#">出来层</a>
</div><div id="divObj" style="position: absolute; width:200px; height:200px; background:blue; border:1px solid block; display:none; z-index:9999;">
<table id="tab">
<tr>
<td>aaa</td>
</tr>
<tr>
<td>bbb</td>
</tr>
</table>
</div>
<div style="position:absolute; top:200px; left:200px;">
<input type="text" id="aaa" />
</div>
</div>
</form>
</body>
</html>
