xorshift.js

var rng_state;

function xorshift32() {
	rng_state ^= rng_state << 13;
	rng_state ^= rng_state >> 17;
	rng_state ^= rng_state << 5;
	return rng_state;
}

function rnd(max) {
	return Math.abs(xorshift32()) % max;
}

rng_state = Date.now();