jQuery vs. MooTools
“Most people getting started with JavaScript these days are faced with the challenging task of picking a library to use, or at least which one to learn first. If you’re working for a company chances are they have already chosen a framework for you, in which case the point is somewhat moot. If this is the case and they’ve chosen MooTools and you’re used to jQuery, then this article might still be of some use to you. ”
Written by Aaron Newton
Article here:
http://jqueryvsmootools.com/
I do not use JavaScript because they do not even know which side to go to him!