显示隐藏菜单
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</tr> <tr id="tr2" style="display:none;"> <td height="65" valign="top"><table width="100%" border="0"> <tr> <td>第一讲</td> </tr> <tr> <td>第二讲</td>
</tr> <tr> <td>第三讲</td> </tr> </table></td> </tr> <tr> <td height="23" style="cursor:pointer;" onclick="showInfo('tr3')">JavaEE教程</td>
</tr> <tr id="tr3" style="display:none;"> <td height="65" valign="top"><table width="100%" border="0"> <tr> <td>第一讲</td> </tr> <tr> <td>第二讲</td>
</tr> <tr> <td>第三讲</td> </tr> </table></td> </tr></table></body></html>