框架页面代码:
 <frameset rows="34,*" frameborder=0 framespacing=0 border=0>
      <frame src=../top.aspx name="top" noresize scrolling=no>
          <frameset cols="120,15,*" frameborder=0 framespacing=0 id="myFrame" border=0>
              <frame src="left.aspx" name="left" noresize>
              <frame scrolling=no src="center.aspx" name="center" noresize>
              <frame src="right.aspx" name="right" noresize>
          </frameset>
      </frameset>
      <body>
      </body>

在center.aspx里面我们这样:

<%@ Page language="c#" Codebehind="center.aspx.cs" AutoEventWireup="false" Inherits="hualong.bbs.center" %>     <script language="javascript">

<!--

function xianshi()

{
      if(parent.document.all.myFrame.cols == "120,15,*")
               {

                    parent.document.all.myFrame.cols = "0,15,*";
               }
     else
              {

                   parent.document.all.myFrame.cols = "120,15,*";
               }
}
//-->
</script>

其中myFrame是框架页面中那个frameset的id

 <body bottommagin=0>
<table okclick="xianshi();" style="CURSOR:hand">