Major Description
amq.js uses a script loading technique to include behavior.js, prototype.js and _amq.js. The Behavior library is included only for the purposes of the chat client and is only GUI in nature, so that should go. Also, Prototype is included for its AJAX functionality, however everyone has their favorite javascript library and although I cut my teeth on prototype, I use jQuery now. I certainly don't want amq.js to include prototype when I have a perfectly good AJAX library already included in jQuery.
IMHO, amq.js should include only the functionality of client-side javascript-enabled JMS. The page author should include her AJAX library of choice (prototype, dojo, jquery, mootools, etc.) and an adapter class that allows amq.js to use the particular ajax library.