If you send me FTP information then I can debug it for you.
I'd start by removing the scripts from the page one at a time and see if the button works then. I'm thinking it will. Then I'd try to isolate the exact script and line that is causing the issue.
It isn't really a button.. it is an image with a link around it. It should work. That is why I'm thinking one of the other scripts is disabling it.