simple function that returns a random number between a expected range

getRandom.js

function getRandom(min, max) {
	if (min > max) {
		return -1;
	}

	if (min == max) {
		return min;
	}

	var r;

	do {
		r = Math.random();
	}
	while (r == 1.0);

	return min + parseInt(r * (max - min + 1));
}