show a 'thankyou' page instead of stats page

my site is hosted by freewebspace.com, (although I have one of their pay per month packages). All my files for site are based at root of my site, http://webworksrus.freewebspace.com/all_my_site_files.

I want to show a thankyou page after user hits send button. Freewebspace.com say code to enter is:

they stress that the path put in value area should be relative to where you currently are, (in my case the enquiry form), and not absolute. My files are located like this:

http://webworksrus.freewebspace.com/enquiryform.htm

http://webworksrus.freewebspace.com/thankyou.htm

I've tried entering value="thankyou.htm" and have also tried full path but neither work. The form still gets submitted okay but it is still the success / stats page being shown. Any ideas? You can't upload CGI to freewebspace but they have quite a good CGI section. Hope you can help.