网页变形问题求教

HTML code

<div id="containerr">  <div id="header"></div>  <div id="mainContent">  <table>   <td>    <tr>       <div id="sidebar" style="border:1px solid gray; ">     <form id="form1" runat="server">     <div>      <asp:TreeView ID="tree" runat="server">     </asp:TreeView>      </div>    </form>    </div>  <td style="width: 10pt"><div class="navPoint" id="switchPoint" onclick="switchSysBar()"      style="background:#666666;width:12px; background:url(images/01.gif);cursor:pointer" >3</div>     </td>  <td style="WIDTH: 100%">  <div id="content">  <div style="z-index:9;width:100%;height:530px; border-top:1px solid gray"id="container"></div>  </div>  </td>  </td> </tr></table>    </div>  </div>

CSS code

body{background:#ecefff repeat top left;}table{ margin:20px auto;}.NiuNiutree{width:220px; height:500px; overflow:auto;}.navPoint{COLOR:#666;CURSOR:hand;FONT-FAMILY:Webdings; FONT-SIZE:9pt}

网页用了一个树形结构，如果把table{ margin:20px auto;}删掉网页变形，不删掉树形结构变形。不知道怎没修改





[解决办法]
那我来接分吧
[解决办法]
等待接分
[解决办法]
等待接分