[Cmptr_Prgrmr2B]

I am trying to recreate a simple version of Pong. I am almost positive that I coded it correctly, though I apparently didn't because it's not working. I would be much appreciative if someone would take a look at my code and point me in the right direction. I'll put the code up, but since this is Flash, I'll also put the actual program file up as an attachment.

Thanks,
Cmptr_Prgrmr2B

player.onEnterFrame = function() {
	player._y = _root._ymouse;
}

opp.onEnterFrame = function() {
	if (ball._y < opp._y) {
		opp.dy = - opp.speed;
	} else {
		opp.dy = opp.speed;
	}
	
	opp._y += opp.dy;
}

init();

function init() {
	mouse.hide();
	
	ball.dx = 15;
	ball.dy = 5;
	
	opp.speed = 10;

	playerScore = 0;
	oppScore = 0;
}


ball.onEnterFrame = function() {
	ball.move();
	ball.checkBoundaries();
	ball.checkPaddles();
}

ball.move = function() {
	ball._x += ball.dx;
	ball._y += ball.dy;
}

ball.checkBoundaries = function() {
	if(ball._y < 0) {
		ball.dy = -ball.dy;
	}
	
	if(ball._y > Stage.height) {
		ball.dy = -ball.dy;
	}
	
	if(ball._x < 0) {
		oppScore++;
		
		ball._x = opp._x - 60;
		ball._y = opp_y;
		ball.dy = 0;
	}
	
	if(ball._x > Stage.width) {
		playerScore++
		
		ball._x = player._x + 50;
		ball._y = player._y;
		ball.dy = 0;
	}
}

ball.checkPaddles = function() {
	if (ball.hitTest(player)) {
	ball.dx = -ball.dx;
	ball.dy = getDy(player);
	}
	if (ball.hitTest(opp)) {
		ball.dx = -ball.dx;
		ball.dy = getDy(opp);
	}
}

function getDy(paddle) {
	relY = ball._y - paddle._y;
	relPerc - relY / paddle._height;
	trace ("relPerc");
	
	newDy = relPerc * 30;
	trace("NewDy");
	return newDy;
	
}