Play mc/video backwards

1

I have a video by frames in the timeline on the stage, and i want it to play backwards when i press the button.

i got this code and it works really good, but i need it to stop on certain frames (127, 177) how do i do that?

stop ();

var rewind:Boolean = true;

playbtn.addEventListener(MouseEvent.MOUSE_DOWN, forward);
backbtn.addEventListener(MouseEvent.MOUSE_DOWN, backward);
addEventListener(Event.ENTER_FRAME, checker);

function forward(event:MouseEvent) {
    rewind = false;
}

function backward(event:MouseEvent) {
    rewind = true;
}

function checker(event:Event) {
    if(rewind) { if(currentFrame > 0) {prevFrame();}} 
	else {if(currentFrame < totalFrames) {nextFrame();}		
    }
}

i am new to action script, can someone please help?

or maybe there is better way to achieve same result. thank you.

heres the link on the scenehttp://dl.dropbox.com/u/2197497/playbackwards.rar