javascript number format indian currency

(1234567.8).toFixed(2).replace(/(\d)(?=(\d{2})+\d\.)/g, '$1,') // "12,34,567.80"    var x=12345678;
    x=x.toString();
    var lastThree = x.substring(x.length-3);
    var otherNumbers = x.substring(0,x.length-3);
    if(otherNumbers != '')
        lastThree = ',' + lastThree;
    var res = otherNumbers.replace(/\B(?=(\d{2})+(?!\d))/g, ",") + lastThree;
    alert(res);