function checkout_payment_init() {
	if(document.checkout_payment.payment.value) return; // hidden field, only single payment method allowed
	var optionsStyle = ".paymentoptions {display: none;}";
	addCss(optionsStyle);
	for (var i=0; i < document.checkout_payment.payment.length; i++)
	{
		var pmt_val = document.checkout_payment.payment[i].value;
		var pmt_id = "payment" + pmt_val;
		var e = document.getElementById(pmt_id);
		addEvent(e, 'click', show_payment_options);
		if(e.checked)
		{
			var pmt_opt_id = "paymentoptions" + pmt_val;
			document.getElementById(pmt_opt_id).style.display = 'block';
		}
	}
}

function show_payment_options() {
	for (var i=0; i < document.checkout_payment.payment.length; i++)
	{
		var pmt_val = document.checkout_payment.payment[i].value;
		var pmt_opt_id = "paymentoptions" + pmt_val;
		var e = document.getElementById(pmt_opt_id);
		if(e)
		{
			if (document.checkout_payment.payment[i].checked) {
				e.style.display = 'block';
			} else {
				e.style.display = 'none';
			}
		}
	}
}

/* *** library functions *** */
function addCss(cssCode) {
	var styleElement = document.createElement("style");
	styleElement.type = "text/css";
	if (styleElement.styleSheet) {
		styleElement.styleSheet.cssText = cssCode;
	} else {
		styleElement.appendChild(document.createTextNode(cssCode));
	}
	document.getElementsByTagName("head")[0].appendChild(styleElement);
}

function addEvent( obj, type, fn ) {
	if (obj.addEventListener) {
		obj.addEventListener( type, fn, false );
		EventCache.add(obj, type, fn);
	}
	else if (obj.attachEvent) {
		obj["e"+type+fn] = fn;
		obj[type+fn] = function() { obj["e"+type+fn]( window.event ); }
		obj.attachEvent( "on"+type, obj[type+fn] );
		EventCache.add(obj, type, fn);
	}
	else {
		obj["on"+type] = obj["e"+type+fn];
	}
}

var EventCache = function(){
	var listEvents = [];
	return {
		listEvents : listEvents,
		add : function(node, sEventName, fHandler){
			listEvents.push(arguments);
		},
		flush : function(){
			var i, item;
			for(i = listEvents.length - 1; i >= 0; i = i - 1){
				item = listEvents[i];
				if(item[0].removeEventListener){
					item[0].removeEventListener(item[1], item[2], item[3]);
				};
				if(item[1].substring(0, 2) != "on"){
					item[1] = "on" + item[1];
				};
				if(item[0].detachEvent){
					item[0].detachEvent(item[1], item[2]);
				};
				item[0][item[1]] = null;
			};
		}
	};
}();

addEvent(window,'unload',EventCache.flush);

function currencyFormat($number)
{
	return '$' + $number.toDecimals(2);
}

Number.prototype.toDecimals=function(n)
{
	n=(isNaN(n)) ? 2 : n;
	var nT=Math.pow(10,n);
	function pad(s)
	{
		s=s||'.';
		return (s.length>n) ? s : pad(s+'0');
	}
	return (isNaN(this)) ? this : (new String(Math.round(this*nT)/nT)).replace(/(\.\d*)?$/,pad);
}