So each time the user presses the UP arrow key, you want a movieclip to be attached from the library, played, and the removed when complete?
What do you want to happen when the user presses the key repeatedly before the first movieclip has finished playing?
well in mid jump. I would like it not to be able to jump again until it has landed. Pretty much the original super mario on the nes. Not too concerned about the power of the button press though for jumping higher and lower.