Problem's with Mutible scripts on one page that I need to work right!

I have 3 scripts on one page will call them script 1, 2, 3 scripts 1 and 2 work well together, but when adding script 3 only script 1 works, very weird. I have look for on load and onclick actions through out cant seem to find any. If someone could point out what I am missing that would be great. url Home The form script is not working correctly and the .nav script isnt working correctly. Any help would be great thank You!!!