JS RNG

//Javascript random number generator, that allows to be seeded
//quite high quality numbers even for its simplicity.
//Suitable for simple random number generation (not crypto).
//Since it allows seeding, it also allows the user to run this in sync with others.
myrand=
{
    z:1,
    w:2,
    next:function(i)
    {
        myrand.z=36969*(myrand.z & 65535)+(myrand.z>>16);
        myrand.w=18000*(myrand.w & 65535)+(myrand.w>>16);
        var res=Math.abs(myrand.z<<16)+myrand.w;
        return i?res%i:res;
    },
    seed:function(a,b)
    {
        myrand.z=Math.abs(a||1);
        myrand.w=Math.abs(b||1);
        if(a===undefined || b===undefined)
        {
            myrand.seed(myrand.next(),myrand.next());
        }
    }
};