function trim(s) 
{
	return s.replace(/^\s+|\s+$/g,'');
}
function round_number(num, dec) {
	var result = Math.round(num*Math.pow(10,dec))/Math.pow(10,dec);
	return result;
}

function update_event_qty(obj)
{
	var qty = parseInt(obj.value);
	var unit_price = parseFloat(document.getElementById('event_option_price').innerHTML.replace('$', ''));
	
	if (!isNaN(qty) && !isNaN(unit_price)) {
		document.getElementById('event_qty').innerHTML = qty;
		document.getElementById('event_total_price').innerHTML = '$' + round_number(qty * unit_price, 2);
	} else {
		document.getElementById('event_qty').innerHTML = 0;
		document.getElementById('event_total_price').innerHTML = '$0.00';
	}
}

function update_event_price(obj)
{
	var qty = parseInt(document.getElementById('qty').value);

	var unit_price = parseFloat(obj.value.replace('$', ''));
	//var unit_price = parseFloat(document.getElementById('event_option_price').innerHTML.replace('$', ''));
	
	if (!isNaN(qty) && !isNaN(unit_price)) {
		document.getElementById('event_option_price').innerHTML = '$' + round_number(unit_price, 2);
		document.getElementById('event_qty').innerHTML = qty;
		document.getElementById('event_total_price').innerHTML = '$' + round_number(qty * unit_price, 2);
	} else {
		document.getElementById('event_qty').innerHTML = 0;
		document.getElementById('event_total_price').innerHTML = '$0.00';
	}
}

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