function formatCurrencyElement(elementId)
{
	var element = $get(elementId);
	if (element == null) return;
	
	element.value = formatCurrency(element.value);
};

function formatCurrency(num)
{
	if(num==null || num.toString()=="") return '';
	
	num = num.toString().replace(/\$|\,/g,'');
	if(isNaN(num)) return '';
	
	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);
};