wagnerand

 function levenshtein(s1, s2) {
        var i, j, cost, v0, v1, v_tmp, a, b, c,
            L1 = s1.length,
            L2 = s2.length;

        if (L1 === 0) {
            return L2;
        } else if (L2 === 0) {
            return L1;
        } else if (s1 === s2) {