function randomNumber(low:Number=NaN, high:Number=NaN):Number {
	var low:Number = low;
	var high:Number = high;
 
	if(isNaN(low)) {
		throw new Error("low must be defined");
	}
	if(isNaN(high)) {
		throw new Error("high must be defined");
	}
 
	return Math.round(Math.random() * (high - low)) + low;
}