Can't the the playback head to start playing again

I've got a slider bar that I'm using to scrub the playback head. I also have a stop and a play button. The Stop and Play buttons have something like

on (release) {
_root.play();
}

and the script in the scrub bar is this :


this.ratio = 50;
dragger.onPress = function()
{
this.startDrag(true, 0, 0, line._width, 0);
this.onEnterFrame = function()
{
ratio = Math.round(this._x * 100 / line._width);
_root.gotoAndStop(Math.round((ratio * _root._totalframes) / 100));
};
};
dragger.onRelease = dragger.onReleaseOutside = stopDrag;
dragger.onEnterFrame = function()
{
this._x = Math.round(100 * _root._currentframe / _root._totalframes);
};

My problem is that the start and stop buttons stop working as soon as I use the scrub bar button ("dragger").

Can someone kindly point out the error of my ways?
Thanks.