你输入的文本框给个值
---------------------------=in a page
<input type="text" value="<%=request.Cookie("zhi")%>" id="a">
----------------------------=in b page
<%
a=request("a")
if not a="" Then
response.Cookie("zhi")=a
End if
...
response.write "<script>alert('输入有误');history.back();</script>"
response.end