public boolean collisionSide(Obstacle[][] obs,int i, int j, int k, int l) {
		// Left side 
		boolean collide = collisionSideHelp(obs,i,j,l);
		while (k<width){	// move to right side
			k += Obstacle.getWidth();
			++j;
		}
		// Right side
		collide |= collisionSideHelp(obs,i,j,l);
		return collide;
	}