I\'m trying to build a page on my personal website that both used jQuery and implements Facebook Connect.
Unfortunately, the Facebook
The post you've referenced is quite old and out of date. The 1.0 release of jQuery UI had this issue in a couple of files and was fixed as soon as it was reported.
All of jQuery UI is wrapped in a closure that passes in jQuery as $ and therefore can use $ internally while $ is used for something else externally.
From http://docs.jquery.com/Using_jQuery_with_Other_Libraries#Referencing_Magic_-_Shortcuts_for_jQuery
Use the following technique, which allows you to use $ inside of a block of code without permanently overwriting $:
(function($) { /* some code that uses $ */ })(jQuery)
Note: If you use this technique, you can still use Prototype via window.$ e.g., window.$('some_element_id'). Any function outside of your closure that references $ will invoke Prototype, even if called from inside your closure.
This is why you'll see $ inside the jQuery UI files, but rest assured, any recent version of jQuery UI (1.5+) is completely supported with jQuery.noConflict()