Your template also includes mootools and this makes troubles. It is "rt_bentobox". You could try to fix this in uddeim for your site (remove the include javascript line with mootools) when it does not work you can only switch autocomplete off, I am sorry.
uddeIM & uddePF Development
CB Language Workgroup
CB 3rd Party Developer
I haven't played around with it. I just turned off the autocomplete. You should just be able to remove the code that calls mootools in includes.php. This will only work if you are loading mootools in your template, which I presume you are.