js digital currency format mutual conversion

//Convert 1,234,567.00 to 1234567.00  
function moneyToNumValue(val) {
    var num = val.trim ();
    var ss = num.toString ();
    if (ss.length == 0) {
        return "0";
    }
    return ss.replace(/,/g, "");
}

//call: fmoney("12345.675910", 3), return 12,345.676
function fmoney(s, n) {
    n = n > 0 && n <= 20 ? n : 2;
    s = parseFloat((s + "").replace(/[^\d\.-]/g, "")).toFixed(n) + "";
    var l = s.split(".")[0].split("").reverse(),
    r = s.split(".")[1];
    t = "";
    for (i = 0; i < l.length; i++) {
        t += l[i] + ((i + 1) % 3 == 0 && (i + 1) != l.length ? "," : "");
    }
    return t.split("").reverse().join("") + "." + r;
}