//***********************************
// generic positive number decimal formatting function
function format(lexpr, decplaces) {
	// raise incoming value by power of 10 times the
	// number of decimal places; round to an integer; convert to string
	var str = "" + Math.round (eval(lexpr) * Math.pow(10,decplaces))
	// pad small value strings with zeros to the left of rounded number
	while (str.length <= decplaces) {
		str = "0" + str
	}
	// establish location of decimal point
	var decpoint = str.length - decplaces
	// assemble final result from: (a) the string up to the position of
	// the decimal point; (b) the decimal point; and (c) the balance
	// of the string. Return finished product.
	return str.substring(0,decpoint) + "." + str.substring(decpoint,str.length);
}
// turn incoming expression into a dollar value
function dollarize(lexpr) {

	return formatCurrency(format(lexpr,2))
}
function formatCurrency(num) {
num = num.toString().replace(/\$|\,/g,'');
if(isNaN(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 ('$' + num + '.' + cents);
}