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=4
document.all("frmTitle").style.display="none"
}else{
switchPoint.innerText=3
document.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>