Pseudo Random number generator in range From A to B

I try to make simple and quick pereatable random number generator in range 0 to 1.000.000 In the function params i receive (String) A (The seed string from first side) and B (Seed from second side)
Received number must be repeatable ... I make some function in JS

SHA256 by library CryptJS http://ift.tt/1vHUZzp

function randomWithSeeds(usr,srv)
{
    var hash =   CryptoJS.SHA256(CryptoJS.SHA256(usr+srv).toString()).toString();
    while (1==1)
    {   
        var index = 0
        while (index <= (64-4))
        {

            r = hash.slice(index, index+4);
            work = "";
            for (i=0; i<=2; i++) {
            work +=r[i].charCodeAt(0);
            }
            if (Number(work) < 16000000)
                return (work % 1000000)
            index += 4
        }
    }
    return -1
}

Minimal number I receive is 4848, but expected minimal ZERO .... Please help!

may be for Python also?