I already created the incident for you when i first mentioned it. It should be in your support history as an open issue with the same topic as this thread.
Incidentally I cannot reproduce the problem... maybe you have an older cached version of the .js file and just need to clear your cache.
I did get a javascript error in IE associated with your mootools-core.js file in the /js folder. I've attached a version of that page that I think will correct that problem.