Transitions Help?

Okay so I have been playing with the transition classes such as

import mx.transitions.*;
import mx.transitions.easing.*;
TransitionManager.start(img1_mc, {type:Zoom, direction:Transition.IN, duration:2, easing:Elastic.easeOut});

that make transition for me. I want to know how to make it so when I roll over a button it does the transition.
:mu::gm::tired::trout::love::ch::s::shifty::scream::cantlook::}I:-):sigh::esmirk::be::ne::stare::rocker: