Auto suggest help, enter submits in IE not Firefox

[JoeAtRevolutionUnltd]

I am working with an auto suggest box that retrieves a list of "suggestions" from my database and shows as a drop down when you start typing. I am having a problem when selecting one of the options. In IE and Firefox when you click an option it works fine, doesn't submit the form. But in IE when you press enter, the form is automatically submitted which is what I don't want. Works fine in Firefox.

The original script is here.

http://www.brandspankingnew.net/archive/2006/08/ajax_auto-suggest_auto-complete.html

My copy is here.

http://revolutionpromotions.net/search/

And the javascript is here.

http://revolutionpromotions.net/search/js/bsn.AutoSuggest_2.1.3_comp.js

Can anyone help me out?

Thanks.