Asp+javascript implement 404-page processing conversion _ Application Skills

Mainly to the user's friendliness, the original user is relying on search engines to enter every article, how can let the user let an old page jump to a new page, and the article unchanged, such as:

Program code
http://www.jb51.net/blog/article.asp?id=381//Old URL
Automatically jump to after entering
http://www.jb51.net/article.asp?id=381


This requires 404 pages of the new321 server to process, the code is as follows:

Program code
<%
Url=request.servervariables ("Query_string")
Arr=split (URL, "/blog") ' Use/split
N=ubound (arr) ' Obtain the last one/
%>

<script language= "JavaScript" >
window.top.location= "http://www.jb51.net<%= arr (n)%>";
</script>


Of course, only suitable for use with the program