js切换

Question

请问为什么我的这个代码在IE有效，在google没效啊。。      function secBoard(n)
  {
    for(i=0;i<secTable.cells.length;i++)
      secTable.cells[i].className="sec3";
    secTable.cells[n].className="sec4";
    for(i=0;i<mainTable.tBodies.length;i++)
      mainTable.tBodies[i].style.display="none";
    mainTable.tBodies[n].style.display="block";
  }求真相！！！谢谢googleiefunction

Answer 1

<table id="mainTable" align="center" border="0" cellpadding="0" cellspacing="0" class="main_tab"
            width="100%">
           
            <tbody>
                <tr>
                    <td align="center" valign="top">11111111111111111111111111111111</td>
                </tr>
               </tbody>
   
   
   
   
   
            <tbody style="display: none">
                <tr>
                    <td align="center" valign="top">2222222222222222222222222</td>
                </tr>
               
            </tbody>




            <tbody style="display: none">
                <tr>
                    <td align="center" valign="top">333333333333333333333333</td>
                </tr>
               
            </tbody>
        </table>
这是下面的代码