How to stop infinite Menu?

1

Hi all!

I was just wondering what I have to ad to this as to make the menu stop when someone drags over it… and the start again when they roll out?!

onClipEvent (load){
	xcenter=500;
	speed=1/100;
}
onClipEvent (enterFrame){
	var distance=_root._xmouse-xcenter;
	_x+=(distance*speed);
}
onClipEvent (enterFrame){
	var distance=_root._xmouse-xcenter;
	_x+=(distance*speed);
	if (_x > 0) _x=-1875;
	if (_x < -1875) _x=0;
}