Buttons in rollOver menu

[color=black][font=Arial]I’m trying to create a menu, where some buttons becomes visible when the user “rollOver” a box the buttons is beneath. Look at [/font][/color][color=black][font=Arial][color=#800080]http://www.grupotecnimede.com/[/color][/font][/color][color=black][font=Arial] menu system, at the main page.[/font][/color]

[color=black][font=Arial]I place my buttons within a MC, and gives the MC this AS:[/font][/color][color=black][font=Arial]
[AS]onClipEvent (load){
change = false;
}
onClipEvent (enterFrame){
if(change == true){
this.nextFrame();
} else {
this.prevFrame();
}
}
on (rollOver){
change = true;
}
on (rollOut){
change = false;
}[/AS][/font][/color][color=black][font=Arial]But when I move the mouse over the buttons, they aren’t enabled, probably because flash got the idea that the MC is above the buttons, and that the MC is a button.[/font][/color]

[color=black][font=Arial]Anybody got at solution to this problem of mine?[/font][/color]