Update jquery to 1.10.1. 1.10.0 version has a very nasty animate() bug.

Due to bug http://bugs.jquery.com/ticket/13939, it is not possible to
animate() elements with relative positions. E.g.: 'marginLeft': '+=20px.'.
This bug has been fixed on 1.10.1 version, as detailed here:
http://blog.jquery.com/2013/05/30/jquery-1-10-1-and-2-0-2-released/