formatNumber.js

function fnFormatNumber( number, decimals, dec_point, thousands_sep ) {   
  var n = number, c = isNaN(decimals = Math.abs(decimals)) ? 2 : decimals;
  var d = dec_point == undefined ? "," : dec_point;
  var t = thousands_sep == undefined ? "." : thousands_sep, s = n < 0 ? "-" : "";
  var i = parseInt(n = Math.abs(+n || 0).toFixed(c)) + "", j = (j = i.length) > 3 ? j % 3 : 0;
  var p = c ? Math.abs(n - i).toFixed(c).slice(2) : 0;
  return s + (j ? i.substr(0, j) + t : "") + i.substr(j).replace(/(\d{3})(?=\d)/g, "$1" + t) + ((Math.floor(p) > 0) ? d + p : "");
}