asp.net关于post表单传值，中间页面过期的问题，高人请进

Question

这是大体的是实现代码。希望大家能指点，找出问题的原因
<script language='javascript'>
var href=window.location.href;
document.write('<form name=myForm></form>');
var a=document.cookie;
var url1='num=1';var url2='num=2';
var index1=a.indexOf(url1);
var index2=a.indexOf(url2);
var index3=href.indexOf('#');
if(((index1==-1)&&(index2==-1))||(index3==-1)){
myForm.innerHTML+='<textarea name=ChuanZhiName>'ChuanZhiValues'</textarea>';
myForm.action='B.aspx';
myForm.method='POST';
document.cookie=url1;
window.location.href=href+'#';
myForm.submit();}";
else{
     if(index1!=-1){document.cookie=url2;history.back();};
     else{document.cookie=url1;history.forward();}
    }                                                }