csdn“隐藏菜单”的问题？

Question

m.htm========
<frameset name="par" cols="80,*" frameborder="NO" border="0" framespacing="0">
  <frame src="left.htm" name="leftFrame" scrolling="NO" noresize>
  <frame src="right.htm" name="mainFrame">
</frameset>left.htm========
<span onclick="top.mainFrame.con.style.display='block';top.par.cols='0,*';">關閉</span>right.htm========
<span id="con" onclick="this.style.display='none';top.par.cols='80,*'" style="display:none;">菜單</span>主頁面