Dreamweaver Drop Down menu problem

Hello, I created a drop down menu in Dreamweaver MX using their show pop-up behavior. It works fine when I do the preview or if I open it on my hard drive. But when I upload it to the server the rollover effects work but the drop down menus do not work. I have uploaded the mm_menu.js file and it is in the same directory as the index.html file. So I have no idea why this is not working. I have looked online and can't seem to find an answer. Anyone run across this before?

Wonder if your firewall settings are doing that? Might be that script is disabled on external wan. "Best Practices", Event viewer, host file, perfmon, antivirus, anti-spyware, Live CD's, backups, are in my top 10