ASP.NET 点击按钮 文本框出现",,," 谁能帮解决一下！谢谢

<%@ Page Language="C#" AutoEventWireup="true" CodeFile="Default3.aspx.cs" Inherits="测试_Default3" %><!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html>
<head>
    <style>
        body
        {
            text-align: center;
        }
        .tab
        {
            width: 432px;
            height: 208px;
            margin: 0 auto;
            overflow: hidden;
            border: 1px solid #cccccc;
        }
        .menu, .menu li
        {
            margin: 0;
            padding: 0;
            height: 24px;
            list-style: none;
            overflow: hidden;
            text-align: center;
        }
        .menu
        {
            border-bottom: 1px solid #cccccc;
        }
        .menu .default
        {
            width: 84px;
            float: left;
            font-size: 10pt;
            line-height: 1.5;
            margin-left: 1px;
            cursor: pointer;
            background: url(         'http://www.webjx.com/upfiles/20070905/20070905212648_01.jpg' ) no-repeat;
        }
        .menu .active
        {
            width: 84px;
            float: left;
            font-size: 10pt;
            line-height: 1.5;
            margin-left: 1px;
            cursor: pointer;
            font-weight: bold;
            color: #FFFFFF;
            background: url(         'http://www.webjx.com/upfiles/20070905/20070905212705_02.jpg' ) no-repeat;
        }
        #more
        {
            width: 76px;
            float: left;
            font-size: 10pt;
            line-height: 1.5;
            margin-left: 1px;
            cursor: pointer;
            color: #FF0000;
            font-weight: normal;
            text-align: right;
        }
        .con
        {
            width: 422px;
            height: 184px;
            margin: 0 auto;
        }
    </style><script>
function init(ids,cons,dis){
   document.getElementById(ids).getElementsByTagName('li')[0].className='active';
  document.getElementById(cons).innerHTML=document.getElementById(dis+"l1").innerHTML;
//  document.getElementById(ids).onmouseover=function(){onmousOver(ids,cons,dis);}//鼠标指向激发效果
  document.getElementById(ids).onclick=function(){onmousOver(ids,cons,dis);}//点击激发效果
}
function onmousOver(ids,cons,dis){
o = o || window.event;
var obj=o.target || o.srcElement;
if (obj.tagName=='LI'){
  if (obj.className=='active'||obj.id=='more')return;
  var o=document.getElementById(ids).getElementsByTagName('li');
  for (var i=0;i<=o.length-1;i++){o[i].className='default'}
  obj.className='active';
  if (obj.className=='active'){document.getElementById(cons).innerHTML=document.getElementById(dis+obj.id).innerHTML;}
}
}
            </script>
    </head>
        <body>
            <form runat="server">
            <!--#1-->
            <div class='tab'>
                <ul id='nav1' class='menu'>
                    <li id="l1" class='default'>第一新闻</li>
                    <li id="l2" class='default'>第二新闻</li>
                    <li id="l3" class='default'>第三新闻</li>
                    <li id="l4" class='default'>第四新闻</li>
                    <li id="l5" class='default'>第5新闻</li>
                </ul>
                <div class='con' id='con1'>
                </div>
            </div>
            <div style="display: none">
                <div id="div1_l1">
                    <asp:TextBox ID="TextBox1" runat="server"></asp:TextBox>
                    <span>11111111111111111111！</span><asp:Button ID="Button1" runat="server" Text="Button" />
                </div>
                <div id="div1_l2">
                    <span>所以特来问一下高手们，请大家帮帮忙！<asp:Button ID="Button2" runat="server" Text="Button" /></span>
                </div>
                <div id="div1_l3">
                    <span>找了几个来改，都是头部的菜单那里太难定位了</span>
                </div>
                <div id="div1_l4">
                    <span>当鼠标放上去时就变，而不用点了！</span>
                </div>
                <div id="div1_l5">
                    <span>增加了！</span>
                </div>
            </div>            <script>
init('nav1','con1',"div1_");
            </script>            </form>
        </body>
</html>