Collision and Stop

programming flash
1

Still try to solve my problem , but i don’t know how . I have a mc whice go to mouse when i press leftbutton.

onClipEvent(load){
    _x=0;
    _y=0;
    slow=10;
}
onClipEvent(mouseDown){
    endX=_root._xmouse;
    endY=_root._ymouse;
}
onClipEvent(enterFrame){
    _x +=(endX- _x)/slow;
    _y +=(endY- _y)/slow;
}

and for collision i know how to do
_root.mc.hitTest(_root.mc2)
This code maybe i 'll put in enterFrame with a condition
My question is …how to stop my increment mc when this touch mc1