Javascript problem with Jquery datapicker

I am transferring an old website into a responsive layout, using a template. The template uses several javascripts and one of these is preventing JQuery Datapicker from working, I have narrowed the problem down to 2 custom Javascript files but am not able to pinpoint, which part is causing the problem. If I remove these 2 files, the datepicker works, although the style layout is not correct. The 2 Javascript files are needed, however, for many of the functions on the website, including the menus, so I need to keep at least part of the contents. I am looking for someone who can correct this problem. The new website is [login to view URL] The problem form is [login to view URL] and I have been testing here: [login to view URL]