function shake() {

    if (top.moveBy) {

x=2; y=8; 

        for (i = x; i > 0; i--) {

            for (j = y; j > 0; j--) {

                top.moveBy(0,i);

                top.moveBy(i,0);

                top.moveBy(0,-i);

                top.moveBy(-i,0);

            }

        }

    }

}

// End -->