function number_format(number, decimals, dec_point, thousands_sep) {
    var n = number, c = isNaN(decimals = Math.abs(decimals)) ? 2 : decimals;
    var d = dec_point == undefined ? "." : dec_point;
    var t = thousands_sep == undefined ? "," : thousands_sep, s = n < 0 ? "-" : "";
    var i = parseInt(n = Math.abs(+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) : "");
}

function update()
{	
	if (document.getElementById('payment_method') == null) {
		var payment_method = 'ideal';
		var shipping_method = 'verzenden';		
	} else {
		var payment_method = document.getElementById('payment_method').value;
		var shipping_method = document.getElementById('shipping_method').value;
	}
		
	document.getElementById('table_shipping').innerHTML = number_format(am_shipping[payment_method][shipping_method], 2, ',');
	document.getElementById('table_total').innerHTML = number_format(am_total[payment_method][shipping_method], 2, ',');
	document.getElementById('table_vat').innerHTML = number_format(am_vat[payment_method][shipping_method], 2, ',');
}