Submit a Form? Can't anyone do this??

[KenDude]

I have an html page at http://www.caymanclub.net/vin_decoder.htm that I would like to "incorporate" into my site instead of just having it as a stand-alone page. My first thought was to try and add it as a page or a template. Whenever I do either the form displays but when a user puts in data and presses the submit button it just returns back to the page showing a blank form again, not the form results.

The page listed above is done in javascript and you can see the full script or copy the whole page and try it on your own server. There is "something" about vbulletin that is keeping this from working but I don't know what it is. I have to believe someone has run into a problem like this before but despite searching this forum and vbadvanced.com's forum I cannot locate an answer to the problem.

BTW the link above works but this link (a template) does not:

http://www.caymanclub.net/?page=vin

Again, any ideas why?