利用JS在asp.net中实现左导航页的隐藏

我们在CSDN论坛上的左上角能够看到导航栏的功能,下面就模拟该功能,利用JS在asp.net中作一个简单的无刷新的左导航栏隐藏功能.
首先,作一个框架页,我们取名 main.aspx
<!-- main.aspx 主要代码 -->
<script>
document.write("<frameset rows='54,28,*,19' frameborder='NO' border='0' framespacing='0'>");
document.write("<frame src='title.aspx' name='topFrame' scrolling='NO' noresize>");
document.write("<frame src='bar.aspx' name='MainNaviFrame' scrolling='NO'>");
<!-- left.aspx是导航页 ,menuswitch.aspx是交互的按钮页 -->
document.write("<frameset name='forum' cols='150,8,*' frameborder='NO' border='0' framespacing='0'>");
document.write("<frame src='left.aspx' name='LeftFrame' scrolling='auto'>");
document.write("<frame src='menuswitch.aspx' name='SwichFrame' scrolling='No'>");

document.write("<frameset rows='100%,*' frameborder='NO' border='0' framespacing='0'>");
document.write("<frame src='' name='MainFrame' scrolling='no'>");
document.write("</frameset></frameset>");
document.write("<frame src='bottom.aspx' name='BottomFrame' scrolling='No'></frameset>");
</script>

<!-- menuswitch.js 主要代码-->
var leftwin = true;

function changeWin()
{
if(leftwin == true)
{
parent.forum.cols = "0,8,*";
parent.SwichFrame.menuSwitch.innerHTML = "<a onclick='changeWin();' style='cursor:hand;'><img src='images/ArrowOpen.gif' border='0'></a>";
leftwin = false;
}
else
{
parent.forum.cols = "150,8,*";
parent.SwichFrame.menuSwitch.innerHTML = "<a onclick='changeWin();' style='cursor:hand;'><img src='images/ArrowClose.gif' border='0'></a>";
leftwin = true;
}
}

<!-- menuswitch.aspx 主要代码 -->
<table height="100%" cellSpacing="0" cellPadding="0" width="8" background="images/MiddleBg1.gif"
border="0">
<tr>
<td onclick="changeWin();" style="cursor:hand;" id="menuSwitch" align="center">
<img id="Image1" src="images/ArrowClose.gif" border="0" />
</td>
</tr>
</table>