Navigation Help

I am building a website for a friend, currently I am working on the navigation, It uses alot of AS tweening to move the menu items around to make room for submenu titles. As you can see in the .swf there is a conflict with buttons, in particular where the over state for the “main page” overlaps with the 3 buttons below it.

.swf
.fla

I was wondering if there was a way that i could get round this? Masking doesnt work, nor does extending the size of the buttons; as they tween out of the way :confused:

Thanks for your help

-ollie :b: