请教

<body style="MARGIN: 0px" scroll=no onResize=javascript:parent.carnoc.location.reload()>
<script>
if(self!=top){top.location=self.location;}
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><style type="text/css">.navPoint {COLOR: white; CURSOR: hand; FONT-FAMILY: Webdings; FONT-SIZE: 9pt}
</style><table border="0" cellPadding="0" cellSpacing="0" height="100%" width="100%">
  <tr>
    <td align="middle" noWrap vAlign="center" id="frmTitle">
    
    
    <iframe frameBorder="0" id="carnoc" name="carnoc" scrolling=no src="left.asp" style="HEIGHT: 100%; VISIBILITY: inherit; WIDTH: 170px; Z-INDEX: 2">
    </iframe>
    
        </td>
    <td bgcolor="A4B6D7" 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>
        <br>
        <br>
        <br>
        <br>
        <br>
        <span class="navPoint" id="switchPoint" title="&#65401;&#65432;&#65393;&#65429;/&#65396;&#65386;&#65431;&#65400;">3</span><br>
        <br>
        <br>
        <br>
        <br>
        <br>
        <br>
        <br>
        &#65414;&#65409;&#65412;&#65403;&#65415;&#65424;&#65403;&#65403; </font></td>
      </tr>
    </table>
    </td>
    <td style="WIDTH: 100%">    <iframe frameBorder="0" id="main" name="main" scrolling="yes" src="Default.asp" style="HEIGHT: 100%; VISIBILITY: inherit; WIDTH: 100%; Z-INDEX: 1">
    </iframe>    </td>
  </tr>
</table>
</html>
<script>
if(window.screen.width<'1024'){switchSysBar()}
</script>