点击隐藏页面左栏或右栏

<style type="text/css"><!--.navPoint {COLOR: white; CURSOR: hand; FONT-FAMILY: Webdings; FONT-SIZE: 9pt}.STYLE1 {FONT-FAMILY: Webdings; FONT-SIZE: 9pt; cursor: hand;}--></style><script>function switchSysBar(){if (switchPoint.innerText==3){switchPoint.innerText=4document.all("frmTitle").style.display="none"}else{switchPoint.innerText=3document.all("frmTitle").style.display=""}}</script><table border="0" cellPadding="0" cellSpacing="0" height="100%" width="100%">  <tr>    <td width="20%" align="middle" vAlign="center" noWrap bgcolor="#CC99FF" id="frmTitle" name="frmTitle"> </td>    <td class=a2 style="WIDTH: 9pt"><table border="0" cellPadding="0" cellSpacing="0" height="100%">      <tr>        <td style="HEIGHT: 100%" onClick="switchSysBar()"><font style="FONT-SIZE: 9pt; CURSOR: default; COLOR: #ffffff"> <br>                <br>                <br>                <br>                <br>                <br>                <br>                <br>                <font color="#FF0000"><br>                <br>                <br>                <br>                <br>                <span class="STYLE1" id="switchPoint" title="关闭/打开左栏">3</span><br>                <br>                <br>                <br>                <br>                <br>                </font><br>                <br>          屏幕切换 </font></td>      </tr>    </table></td>    <td bgcolor="#FFCC99" style="WIDTH: 100%"> </td>  </tr></table>