为什么设置Cookie失败解决方案

为什么设置Cookie失败
用的是框架
左边，left页面：
function   setCookie(name,value,h)
{
var   exp   =   new   Date();
exp.setTime(exp.getTime()   +   h   *   60   *   60   *   1000);
document.cookie   =   name   +   "= "+   escape   (value)   +   ";expires= "   +   exp.toGMTString();
}
function   openLink(url)
{
setCookie( "myframe ",   "left ",   1);
window.parent.frames[ "mainFrame "].location.href   =   url;
}

中间页面
function   window_onload()  
{
                  var   myframe   =   getCookie( "myframe ");
var   exp   =   " ";
if   (myframe   &&   (myframe   ==   "left "))
{
                  exp   =   selexpect;
}
else
{
if   (getCookie( "DadiZcExpect ")   &&   (getCookie( "DadiZcExpect ")   !=   " "))
exp   =   getCookie( "DadiZcExpect ");
else
exp   =   selexpect;
}
setnselect( "expect ",   exp);//设置当前期
if   (getCookie( "zcgid ")   &&   (getCookie( "zcgid ")   !=   " "))
GradeClick(getCookie( "zcgid "));
else
GradeClick(1);
setCookie( "myframe ",   "center ",   1);
alert(getCookie( "myframe "));
}

点击左边的菜单，然后中间显示，执行window_onload();
可是alert出来的值一直是left，请问什么原因？

后来在onunload()事件里也不行
function   window_onunload()  
{
setCookie( "myframe ",   "left ",   1);
}

郁闷。

------解决方案--------------------
看贴了
------解决方案--------------------
function setCookie(name,value,h)
{
var exp = new Date();
exp.setTime(exp.getTime() + h * 60 * 60 * 1000);
document.cookie = name + "= "+ escape (value) + ";expires= " + exp.toGMTString();
}
这个在中间的页面写没？
------解决方案--------------------
get的那个方法是怎么写的啊，我测试了下，没有你说的情况发生啊!帖出测试的代码
三个文件，直接考下去存成文件就可以了
main.htm
<frameset cols= "100,* " name= "ddd ">
<frame src= "4.htm ">
<frame name= "mainFrame " src= "about:blank ">
</frameset>

4.htm*************************************************************
<SCRIPT>
function setCookie(name,value,h)
{
var exp = new Date();
exp.setTime(exp.getTime() + h * 60 * 60 * 1000);
document.cookie = name + "= "+ escape (value) + ";expires= " + exp.toGMTString();
}
function openLink(url)
{
setCookie( "myframe ", "left ", 1);
top.mainFrame.document.location.href = url;
}
</SCRIPT>
<a href= "# " onclick= "openLink( '3.htm ') "> asdasdasd </a>

3.htm********************************************************************
<script language=javascript>
function setCookie(name,value,h)
{
var exp = new Date();
exp.setTime(exp.getTime() + h * 60 * 60 * 1000);
document.cookie = name + "= "+ escape (value) + ";expires= " + exp.toGMTString();