Simple drop down menu issues

Im using a simple drop down menu which I built based on a tute that is similar to the one on kirupa. The problem im having (and ive tested it with the kirupa tute as well) is that if you place these drop down menus next to each other, they dont ‘roll off’ properly.

So lets say you have button 1, button 2 and button 3 (all main menu items with a few sub menus). These are placed verticaly. If you move the mouse too quickly between different menus, the old one doesnt dissapear which creates a few issues.

My menu items have a 1px gap between each other. Is there a solution to this that doesnt involve having a 10px gap?

The second problem I have is that my menu buttons simply arent doing anything when clicked on. I trying to call an external swf but it does nothing when I click on the item. Ive also tried simply telling it to go to a different scene and that didnt work either. I also tried setting the button with a geturl statement, with actually worked.

This is my website:
http://www.3amdesign.com.au/lumo/new-website6/

Cheers!