onRollOut stop MovieClip on next keyframe?

this should be simple or not.

I have a simple movieclip just with some keyframes (no tweening). Now on rollover simple_mc starts to play. All I want to do is to stop simple_mc on the “nearest” keyframe (where the playhead is)


simple_mc.hitArea = simple_mc.hit_mc;
simple_mc.onRollOver = function()
{
	this.gotoAndPlay("_start");	
}
simple_mc.onRollOut = function()
{
	this.gotoAndStop.nextFrame();
}

Any suggestions??