Moving multiple mc's with arrow keys

[font=Arial][size=3][color=black]I used the “Movement Using Keyboard Keys” by K[/color][/size][size=3][color=black]irupa. I have it working, but I want to move multiple mc’s at the same time when I press an arrow key. Only the mc on my lowest level will move. How do I get all of them to move? Thank you for any help.[/color][/size][/font]