[marat_sa]

public static function addSeparatorToPrice(num:int, separator:String = " "):String {
	var pos:int = num.toString().length - Math.floor((num.toString().length - 1) / 3) * 3;
	var str:String = num.toString().substr(0, pos);
 
	while (pos < num.toString().length) {
		str += separator + num.toString().substr(pos, 3);
		pos += 3;
	}
	return str;
}

=)