Something

if (_root.GenInfo_mc_WasReleased == 1) {
    	trace("inside");
	trace("-> "+gen_mc+" <- Target Movie");
        onEnterFrame = rewindClip(gen_mc);
}

function rewindClip(target_mc_clip)
{
        if (target_mc_clip._currentframe != 1)
        {
               target_mc_clip.prevFrame();
        }
        else
        {
                delete onEnterFrame;
        }
}