Wrong button & alpha shadow

1)On the FLA, when i go over the buttons, there must play a movie clip (a button effect), but when i go over them, that animation sometimes plays at the true position, sometimes behind the menu. It must play between menu and the buttons.
A bit confusing? Have a look at the FLA. How can i solve it?

FLA

2)I lowered an objects alpha and put another object onto that object. Second object’s shadow falls on the 1st one. How can i solve it?