ActionScript 2.0 :: Check If Still On Rollover?

a way to check if the mouse is still over a mc.. I have a list of mc's and when I roll over/out each one, the alpha property is set to 100/0. If it's the first roll Over, a thumbs is loaded in it's holder using MovieClipLoader. I use onLoadInit to center the image and set it to alpha 100. But when the user rolls out from the mc before the centering/alpha function is finished, what happens is the mc is set to alpha 0 and then centered and alpha 100. This is causing that many movieclips are still visible until I roll Over/out again to correct the mistake..

here is the code

Code:
function centerImage(target_mc:MovieClip):Void {
target_mc._x = -target_mc._width/2;
target_mc._y = -target_mc._height/2;

[Code].....