GoLive 5 drop down menu problem

Hello

I have created some buttons for my navigation and have put them in a table for layout purposes. I have now tried to create a drop down menu for each button using floating boxes as I have seen in many golive tutorials.

The problem I am having is that floating boxes dont appear. If I take the buttons out of the table everything seem ok.

Can the drop down menu, using floating boxes, not be used within a table? If not then is there any other way of creating the same effect that would work if my buttons are in a table?

Thank You :}