onLoad () {
    tock = ticks();
}
onEnterFrame(includingFirstFrame) {
    tick = ticks();
    delta = tick-tock;
    tock = tick;
    bounce = _root.bounce;
    i = 1;
    while (i <= 3) {
        a = "/Ball"+i;
        j = i+1;
        while (j <= 3) {
            b = "/Ball"+j;
            dx = (a)._X-(b)._X;
            dy = (a)._Y-(b)._Y;
            adx = abs(dx);
            ady = abs(dy);
            d = dx*dx+dy*dy;
            hit = d <= (a)._width*(b)._width;
            if (hit) {
                fx = dx/(adx+ady);
                afx = adx/(adx+ady);
                fy = dy/(adx+ady);
                afy = dy/(adx+ady);
                avx = (a).vx;
                avy = (a).vy;
                bvx = (b).vx;
                bvy = (b).vy;
                vx = afx*(bvx-avx)+fy*(bvy-avy);
                vy = afy*(bvy-avy)+fx*(bvx-avx);
                (a).vx = (avx+vx)*bounce;
                (b).vx = (bvx-vx)*bounce;
                (a).vy = (avy+vy)*bounce;
                (b).vy = (bvy-vy)*bounce;
                n = 0;
                while (hit && n < 10) {
                    (a)._X += (a).vx*delta;
                    (a)._Y += (a).vy*delta;
                    (b)._X += (b).vx*delta;
                    (b)._Y += (b).vy*delta;
                    dx = (a)._X-(b)._X;
                    dy = (a)._Y-(b)._Y;
                    adx = abs(dx);
                    ady = abs(dy);
                    d = dx*dx+dy*dy;
                    hit = d <= (a)._width*(b)._width;
                    n++;
                }
            }
            j++;
        }
        i++;
    }
}