不添加timer控件的时候，页面显示正常；如果添加上了timer控件，页面不显示内容，这到底是什么原因呢？请各位帮忙看看，代码如下所示：
aspx：
<div>
     <table width="100%" border="0" cellspacing="0" cellpadding="0">
        <tr>
            <td class="td1">
                &nbsp;
            </td>
            <td class="td2">
            </td>
            <td class="td3">
                &nbsp;
            </td>
        </tr>
    </table>
    </div>
Css：
.td1
{
    background-image:url("../images/down/main_71.gif");
    line-height: 11px;
    table-layout: fixed;
    width:165px;
    }
    
.td2
{
    background-image:url("../images/down/main_72.gif");
    line-height: 11px;
    table-layout: fixed;
    }
    
.td3
{
    background-image:url("../images/down/main_74.gif");
    line-height: 11px;
    table-layout: fixed;
    width:17px;
    }
--
FROM 219.234.81.*