How to make sure a movie clip will be visible over all other mc

[COLOR=black]Thank you for the [/COLOR][COLOR=red]Complex[/COLOR][FONT=Arial][SIZE=2][FONT=Verdana][SIZE=4][COLOR=#003366][SIZE=2][COLOR=black][COLOR=red]Button RollOver/RollOut Effects[/COLOR]. I was able to create the Flash file mentionned below. The only problem is all except one movie clip are hidden behind the last one placed on the Main timeline. How can I change the hierarchy when the rollover action is triggered so each mc is shown on top of the others ?[/COLOR][/SIZE][/COLOR][/SIZE][/FONT][/SIZE][/FONT]

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Qu├ębec, Canada