Moving a forum

I have moved http://www.national-real-estate-directory.com/real-estate-forum/ to http://www.realestateforum.com and the other pages of the old forum don't redirect the way they should.

Example:

http://www.national-real-estate-directory.com/real-estate-forum/showthread.php?threadid=741

I am using this code:

<%@ Language=VBScript %>
<%
Response.Status="301 Moved Permanently" 
Response.AddHeader "Location", "http://www.realestateforum.com/"
%>

Code (markup):

Any idea why?

Mike