function shake() { 
	if (parent.moveBy){ 
		for (i = 10; i > 0; i--) { 
			for (j = n; j > 0; j--) { 
				parent.moveBy(0,i); 
				parent.moveBy(i,0); 
				parent.moveBy(0,-i); 
				parent.moveBy(-i,0); 
			} 
		} 
	} 
}