public boolean collisionFeet(Obstacle[][] obs, int j, int k) {
		// Testing the boxes below Stubi :
		int i = (y+height)/Obstacle.getHeight(); // box below the Nbox (one occupied by Stubi's feet)
		if (i<0) {
			System.out.println("Above the box");
			return false;
		}
		boolean collide = obs[i][j].CollisionTop();	// box below his left foot
		while (k<width){	// try all boxes below Stubi
			collide |= obs[i][++j].CollisionTop();
			k += Obstacle.getWidth();
		}
		if (collide) {
			inAir = false;
			y = i*Obstacle.getHeight() - height;	// Put Stubi back in his N box if collision
		} else
			inAir = true;
		return collide;
	}