Pop-Up Menu buttons problem

I created a successful popup menu in fireworks mx 2004 which can be viewed at:

[url]http://www.pearsoncustom.com/database/index.html[/url]

If a user hovers over one of the main buttons (let’s say ‘business’ for example) the submenu appears as normal. BUT, if you click on ‘business’, the submenu disappears and doesn’t reappear unless you move the cursor off and then back over the button. I want the submenu to remain no matter how many times ‘business’ (or any other main button) is clicked. I assume something needs to be changed in the javascript but I’ve searched all over and can’t find any help.

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