Button problems

Hi i am making a button that has diferent movie clip for each state. For over state i am using mc that contains diferent animated things. I was wondering is it possible to stop only one of those animations on specific frame. When mouse comes over button few animations start and they loop even mouse has not come off the button. (they just start over) So can i stop only one of those animations so it does not lop and leave rest to loop when mouse is over button for a long time?

help would be greatly appreciated

tnx

LUka