The jQuery 1.9 line has major changes from previous versions. We strongly recommend that you also use the jQuery Migrate plugin if you are upgrading from older versions of jQuery or need to use plugins that haven't yet been updated. Read the jQuery 1.9 Upgrade Guide and the jQuery 1.9 release blog post for more information. -- http://jquery.com/download/

Just be sure to read the information in the jQuery 1.9 upgrade guide so that your transition will be smoother. -- http://blog.jquery.com/2013/01/15/jquery-1-9-final-jquery-2-0-beta-migrate-final-released/

Judging by many of the questions and bug reports we’ve gotten, far too many of you are trying to do an upgrade to jQuery 1.9 without also using jQuery Migrate. Stop hitting yourself! We created this plugin to make things easy on you. Just include the plugin after your jQuery file to see if it gives you any warnings. -- http://blog.jquery.com/2013/01/31/jquery-migrate-1-1-0-released/

The jQuery.browser() method has been deprecated since jQuery 1.3 and is removed in 1.9. If needed, it is available as part of the jQuery Migrate plugin. We recommend using feature detection with a library such as Modernizr. -- http://jquery.com/upgrade-guide/1.9/#jquery-browser-removed

The $.browser property is deprecated in jQuery 1.3, and its functionality may be moved to a team-supported plugin in a future release of jQuery. -- http://api.jquery.com/jQuery.browser/