Submit buttons can work just fine in a multi-tabbed form, but there are some considerations that you'll want to make as you plan it out. I made a long-winded post about it a while back:
http://heo-iforms.blogspot.com/2012/07/reader-request-submit-while-using-tabs.html
Regarding your other question, the "jquery.min.js" is the same functional code as the other; it's just undergone a process to "mini-ify" the code (getting rid of the white space, changing variable names to single characters, etc) to make the file smaller and, by extension, faster to download. The trade-off is that it is no longer even remotely human-readable.
I'd suggest going to the jquery and jquery-ui websites and downloading the most recent released version (as of right now, it's jquery 1.9.0 and jquery-ui 1.10.0). Copy the JS and CSS files up to your server and reference them locally (that way, if there's ever a proxy issue, your iForms will not be impacted).