Number.prototype.formatMoney = function(c, d, t){
			var n = this, 
			  c = isNaN(c = Math.abs(c)) ? 2 : c, 
			  d = d == undefined ? "." : d, 
			  t = t == undefined ? "," : t, 
			  s = n < 0 ? "-" : "", 
			  i = String(parseInt(n = Math.abs(Number(n) || 0).toFixed(c))), 
			  j = (j = i.length) > 3 ? j % 3 : 0;
			 return s + (j ? i.substr(0, j) + t : "") + i.substr(j).replace(/(\d{3})(?=\d)/g, "$1" + t) + (c ? d + Math.abs(n - i).toFixed(c).slice(2) : "");
			};
			
			// (123456789.12345).formatMoney(2, '.', ',');
			alert((123456789.12345).formatMoney(2, '.', ','));