function dollarFmt(num) {
	num = num.toString().replace(/\$|\,/g,'');
	if(isNaN(num)) {	//blank input
		return num;
		//num = "0";
	}
	sign = (num == (num = Math.abs(num)));
	num = Math.floor(num*100+0.50000000001);
	cents = num%100;
	num = Math.floor(num/100).toString();

	if(cents<10)
		cents = "0" + cents;

	for (var i = 0; i < Math.floor((num.length-(1+i))/3); i++)
		num = num.substring(0,num.length-(4*i+3))+','+
		num.substring(num.length-(4*i+3));

	return (((sign)?'':'-') + '$ ' + num + '.' + cents);
}