Movie clip position

1

no matter what i put for _x and _y values the MC appears at 0,0.

Why?

onClipEvent (load) {
_x = 70;
_y = 320;
speed = 5;
}
on(release) {
endX = 78;
endY = 130;
}
onClipEvent (enterFrame) {
_x += (endX-_x)/speed;
_y += (endY-_y)/speed;
}