Javascript issue after moving server

I have recently transferred a website to a new server and I have a dynamically populated box that now doesn't work. What should happen is that I select an area and the next box should populate with the relevant suburbs in that area. However, it now doesn't. Also, once I do a search, the search function doesn't filter my selection - it gives me every available response. The website is here: [login to view URL] - once I award the project I will give you the new and old FTP details and you can go and fix it. I imagine it won't take very long, just a knowledge of Javascript should be able to fix it I would think.