A simple seeded pseudo-random number generator implemented in JavaScript using the Blum Blum Shub method.

seededRand.js

var SeededRand = function(seed, mod1, mod2)
{
    return function()
    {
        seed = (seed*seed) % (mod1*mod2);
        return seed/(mod1*mod2);
    };
};

var rand = SeededRand(seed, mod1, mod2);
// Creates a new random number generator with the given seeds.

rand();
// Spits out a new random value each time it is called.