Drop Down Menu Question

Okay i have what should be a pretty simple question to answer but i can’t seem to get it right.

I have a horizontal menu that has sub nav on some of the buttons. My question is what is the best way to do this.

I have been working on it for a few hours now and can’t seem to come up with the right combination. I have a MC that when you have the sub menu show up it won’t click them.

I have tried using ‘delete this.onRollOver();’ but it doesn’t seem to work right.

I need this to be finished ASAP so if anyone knows a simple solutions i’m all ears.