Fix Javascript and or PHP issues. working registration form

I have an issue with my photo rating/ dating site registration form. When a user completes the form and hits register, a register success page should come up, an email sent to the user confirming registration, and the users details added to the database. This all worked two weeks ago, then I had a coder do some work on the site and to do some 301 redirects to www version. The htaccess file was changed. Prior to this I also had issues with the original script. My analytic software showed over 300 hits on the register success page yet I only had a quarter that many actual sign ups. I suspect the original creator has a javascript code directing most of my signups elsewhere? So... to sum it up 1. Fix issues to make sign up registration page work 2. Check javascript to make sure there is no url redirect or harmful code. site is [login to view URL]