A basic acs help

i have a mc that has this script

onClipEvent (load) {
x = 0;
y = 0;
alpha = 100;
}
onClipEvent (enterFrame) {
_x += (x-_x)/4;
_y += (y-_y)/4;
_alpha += (alpha-_alpha)/4;
}

this allow mwe to generate easing effects
but i wanna know
how i can make that when the mouse pass over this mc some of theyr properties like _x, _y or _alpha get a new value

i know this is simple
but i cant find the answer
thanks