var NextId=1,Custom="Custom",GoogleCheckout="GoogleCheckout",PayPal="PayPal",Email="Email",AustralianDollar=AUD="AUD",CanadianDollar=CAD="CAD",CzechKoruna=CZK="CZK",DanishKrone=DKK="DKK",Euro=EUR="EUR",HongKongDollar=HKD="HKD",HungarianForint=HUF="HUF",IsraeliNewSheqel=ILS="ILS",JapaneseYen=JPY="JPY",MexicanPeso=MXN="MXN",NorwegianKrone=NOK="NOK",NewZealandDollar=NZD="NZD",PolishZloty=PLN="PLN",PoundSterling=GBP="GBP",SingaporeDollar=SGD="SGD",SwedishKrona=SEK="SEK",SwissFranc=CHF="CHF",USDollar=USD="USD";

function Cart(){
/* PUBLIC: */

	/* member variables */
	this.Version = '1.9.9';
	this.Shelf = new Shelf();
	this.items = new Array();
	this.isLoaded = false;
	this.pageIsReady = false;
	this.quantity = 0;
	this.total = 0;
	this.taxRate = 0;
	this.taxCost = 0;
	this.shippingRate = 0;
	this.shippingCost = 0;
	this.currency = EUR;
	this.checkoutTo = Custom;
	this.email = "yadtampons@free.fr";
	this.merchantId	 = "";
	this.cartHeaders = ['Name','Price','Quantity','Total'];
	
	


	/******************************************************
			add/remove items to cart  
 	 ******************************************************/

	this.add = function () {
		/* load cart values if not already loaded */
		if( !this.pageIsReady 	) { 
			this.initializeView(); 
			this.update();	
		}
		if( !this.isLoaded 		) { 
			this.load(); 
			this.update();	
		}
		
		var newItem = new CartItem();
		
		/* check to ensure arguments have been passed in */
		if( !arguments || arguments.length == 0 ){
			error( 'No values passed for item.');
			return;
		}
		
		if( arguments[0] && typeof( arguments[0] ) != 'string' && typeof( arguments[0] ) != 'number'  ){ 
			arguments = arguments[0]; 
		}
	
		newItem.parseValuesFromArray( arguments );
		newItem.checkQuantityAndPrice();
		
		/* if the item already exists, update the quantity */
		if( this.hasItem(newItem) ) {
			var id=this.hasItem(newItem);
			this.items[id].quantity= parseInt(this.items[id].quantity) + parseInt(newItem.quantity);
		} else {
			this.items[newItem.id] = newItem;
		}	
		
		this.update();
	}
	
	
	this.remove = function( id ){
		var tempArray = new Array();
		for( var item in this.items ){
			if( item != id ){ 
				tempArray[item] = this.items[item]; 
			}
		}
		this.items = tempArray;
	}
	
	
	this.empty = function () {
		simpleCart.items = new Array();
		simpleCart.update();
	}


	/******************************************************
			 checkout management 
     ******************************************************/

	this.checkout = function() {
		if( simpleCart.quantity == 0 ){
			error("Cart is empty");
			return;
		}
		switch( simpleCart.checkoutTo ){
			case PayPal:
				simpleCart.paypalCheckout();
				break;
			case GoogleCheckout:
				simpleCart.googleCheckout();
				break;
			case Email:
				simpleCart.emailCheckout();
				break;
			default:
				simpleCart.customCheckout();
				break;
		}
	}
	
	this.paypalCheckout = function() {
		
		var winpar = "scrollbars,location,resizable,status",
			strn  = "https://www.paypal.com/cgi-bin/webscr?cmd=_cart" +
		   			"&upload=1" +
		        	"&business=" + this.email + 
					"&currency_code=" + this.currency,
			counter = 1,
			itemsString = "";
			
		for( var current in this.items ){
			var item = this.items[current];
			
			var optionsString = "";
			for( var field in item ){
				if( typeof(item[field]) != "function" && field != "id" && field != "price" && field != "quantity" && field != "name" ) {
					optionsString = optionsString + "&" + field + "=" + item[field] ; 
				}
			}
			optionsString = optionsString.substring(1);
			
			itemsString = itemsString 	+ "&item_name_" 	+ counter + "=" + item["name"]  +
									 	  "&item_number_" 	+ counter + "=" + counter +
										  "&quantity_"		+ counter + "=" + item.quantity +
										  "&amount_"		+ counter + "=" + this.currencyStringForPaypalCheckout( item.price ) + 
										  "&on0_" 			+ counter + "=" + "Options" + 
										  "&os0_"			+ counter + "=" + optionsString;
			counter++;
			
			
		}
		strn = strn + itemsString ;
		window.open (strn, "paypal", winpar);
	}



	this.googleCheckout = function() {
		if( this.currency != USD && this.currency != GBP ){
			error( "Google Checkout only allows the USD and GBP for currency.");
			return;
		} else if( this.merchantId == "" || this.merchantId == null ){
			error( "Google Checkout only allows the USD and GBP for currency");
			return;
		} 
		
		var form = document.createElement("form"),
			counter = 1;
		form.style.display = "none";
		form.method = "POST";
		form.action = "https://checkout.google.com/api/checkout/v2/checkoutForm/Merchant/" + 
						this.merchantId;
		form.acceptCharset = "utf-8";
		
		for( var current in this.items ){
			var item 				= this.items[current];
			form.appendChild( this.createHiddenElement( "item_name_" 		+ counter, item["name"] 		) );
			form.appendChild( this.createHiddenElement( "item_quantity_" 	+ counter, item["quantity"] 	) );
			form.appendChild( this.createHiddenElement( "item_price_" 		+ counter, item["price"] 		) );
			form.appendChild( this.createHiddenElement( "item_currency_" 	+ counter, this.currency 	) );
			form.appendChild( this.createHiddenElement( "item_tax_rate_" 	+ counter, this.taxRate 	) );
			form.appendChild( this.createHiddenElement( "_charset_"					 , ""				) );
			
			var descriptionString = "";
			
			for( var field in item){
				if( typeof( item[field] ) != "function" && 
									field != "id" 		&& 
									field != "quantity"	&& 
									field != "price" )
				{
						descriptionString = descriptionString + ", " + field + ": " + item[field];				
				}
			}
			descriptionString = descriptionString.substring( 1 );
			form.appendChild( this.createHiddenElement( "item_description_" + counter, descriptionString) );
		}
		
		document.body.appendChild( form );
		form.submit();
		document.body.removeChild( form );
	}
	
	
	
	
	this.emailCheckout = function() {
 
  itemsString = "";
  for( var current in me.items ){ 
      var item = me.items[current];
      itemsString += item.name + " " + item.quantity + " " + item.price + "\n";
  }   
 
  var form = document.createElement("form");
  form.style.display = "none";
  form.method = "POST";
  form.action = "envoyer.php";
  form.acceptCharset = "utf-8";
  form.appendChild(me.createHiddenElement("jcitems", itemsString));
  form.appendChild(me.createHiddenElement("jctotal", me.total));
  document.body.appendChild(form);
  form.submit();
  document.body.removeChild(form);
}  
		


	
	this.customCheckout = function() {
		return;
	}




/* PRIVATE : */

	/******************************************************
				data storage and retrival 
	 ******************************************************/
	
	/* load cart from cookie */
	this.load = function () {
		/* initialize variables and items array */
		this.items = new Array();
		this.total = 0.00;
		this.quantity = 0;
		
		/* retrieve item data from cookie */
		if( readCookie('simpleCart') ){
			var data = unescape(readCookie('simpleCart')).split('++');
			for(var x=0, xlen=data.length;x<xlen;x++){
			
				var info = data[x].split('||');
				var newItem = new CartItem();
			
				if( newItem.parseValuesFromArray( info ) ){
					newItem.checkQuantityAndPrice();
					/* store the new item in the cart */
					this.items[newItem.id] = newItem;
				}
 			}
		}
		this.isLoaded = true;
	}
	
	
	
	/* save cart to cookie */
	this.save = function () {
		var dataString = "";
		for( var item in this.items ){
			dataString = dataString + "++" + this.items[item].print();
		}
		createCookie('simpleCart', dataString.substring( 2 ), 30 );
	}
	
	

	
		
	/******************************************************
				 view management 
	 ******************************************************/
	
	this.initializeView = function() {
		this.totalOutlets 			= getElementsByClassName('simpleCart_total');
		this.quantityOutlets 		= getElementsByClassName('simpleCart_quantity');
		this.cartDivs 				= getElementsByClassName('simpleCart_items');
		this.taxCostOutlets			= getElementsByClassName('simpleCart_taxCost');
		this.taxRateOutlets			= getElementsByClassName('simpleCart_taxRate');
		this.shippingCostOutlets	= getElementsByClassName('simpleCart_shippingCost');
		this.shippingRateOutlets	= getElementsByClassName('simpleCart_shippingRate');
		this.finalTotalOutlets		= getElementsByClassName('simpleCart_finalTotal');
		
		
		this.addEventToArray( getElementsByClassName('simpleCart_checkout') , simpleCart.checkout , "click");
		this.addEventToArray( getElementsByClassName('simpleCart_empty') 	, simpleCart.empty , "click" );
		
		
		this.Shelf.readPage();
			
		this.pageIsReady = true;
		
	}
	
	
	
	this.updateView = function() {
		this.updateViewTotals();
		if( this.cartDivs && this.cartDivs.length > 0 ){ 
			this.updateCartView(); 
		}
	}
	
	this.updateViewTotals = function() {
		var outlets = [ ["quantity"		, "none"		] , 
						["total"		, "currency"	] , 
						["shippingRate"	, "percentage"	] , 
						["shippingCost"	, "currency"	] ,
						["taxCost"		, "currency"	] ,
						["taxRate"		, "percentage"	] ,
						["finalTotal"	, "currency"	] ];
						
		for( var x=0,xlen=outlets.length; x<xlen;x++){
			
			var arrayName = outlets[x][0] + "Outlets",
				outputString;
				
			for( var element in this[ arrayName ] ){
				switch( outlets[x][1] ){
					case "none":
						outputString = "" + this[outlets[x][0]];
						break;
					case "currency":
						outputString = this.valueToCurrencyString( this[outlets[x][0]] );
						break;
					case "percentage":
						outputString = this.valueToPercentageString( this[outlets[x][0]] );
						break;
					default:
						outputString = "" + this[outlets[x][0]];
						break;
				}
				this[arrayName][element].innerHTML = outputString;
			}
		}
	}
	
	this.updateCartView = function() {
		var newRows = new Array();
		
		/* create headers row */
		var newRow = document.createElement('div');
		for( var header in this.cartHeaders ){
			var newCell = document.createElement('div'),
				headerInfo = this.cartHeaders[header].split("_");
			
			if( !( headerInfo[1] == "noHeader") ){
				newCell.innerHTML = headerInfo[0];
				newCell.className = "item" + headerInfo[0];
				newRow.appendChild( newCell );
			}
		}
		newRow.className = "cartHeaders";
		newRows[0] = newRow;
		
		
		/* create a row for each item in the cart */
		var x=1;
		for( var current in this.items ){
			var newRow = document.createElement('div'),
				item = this.items[current];
			
			for( var header in this.cartHeaders ){
				
				var newCell = document.createElement('div'),
					info = this.cartHeaders[header].split("_"),
					outputValue;
				
				switch( info[0] ){
					case "Total":
					case "total":
						outputValue = parseFloat(item['price'])*parseInt(item['quantity']);
						break;
					case "increment":
					case "Increment":
						outputValue = "+";
						break
					case "decrement":
					case "decrement":
						outputValue = "-";
						break;
					case "remove":
					case "Remove":
						outputValue = "Remove";
						break;
					default: 
						outputValue = item[ info[0].toLowerCase() ] ? item[info[0].toLowerCase()] : " ";
						break;
				}	
				
				
				/* formatting outputs */
				
				if( info[0] == "Total" || 
					info[0] == "Price" ||
					info[1] == "currency"){
						
					outputValue = this.valueToCurrencyString( outputValue );
				
				} 
				if( info[1] == "image" ||
						   info[0] == "Image"){
					
					outputValue = this.valueToImageString( outputValue );		
					
				} else if( info[1] == "input" ){
					
					outputValue = this.valueToTextInput( outputValue , "onchange=\"simpleCart.items[\'" + item["id"] + "\'].set(\'" + info[0].toLowerCase() + "\' , this.value);\""  );
				
				}else if( outputValue == "+" ){
					outputValue = this.valueToLink( outputValue , "javascript:;" , "onclick=\"simpleCart.items[\'" + item["id"] + "\'].increment();\"" );
				}else if( outputValue == "-" ){
					outputValue = this.valueToLink( outputValue , "javascript:;" , "onclick=\"simpleCart.items[\'" + item["id"] + "\'].decrement();\"" );
				}else if( outputValue == "Remove"){
					outputValue = this.valueToLink( outputValue , "javascript:;" , "onclick=\"simpleCart.items[\'" + item["id"] + "\'].remove();\"" );
				}
						  
				newCell.innerHTML = outputValue;
				newCell.className = "item" + info[0];
				newRow.appendChild( newCell );
			}			
			newRow.className = "itemContainer";
			newRows[x] = newRow;
			x++;
		}
		
		
		
		for( var current in this.cartDivs ){
			
			/* delete current rows in div */
			var div = this.cartDivs[current];
			while( div.childNodes[0] ){
				div.removeChild( div.childNodes[0] );
			}
			
			for(var j=0, jLen = newRows.length; j<jLen; j++){
				div.appendChild( newRows[j] );
			}
			
			
		}
	}

	this.addEventToArray = function ( array , functionCall , theEvent ) {
		for( var outlet in array ){
			var element = array[outlet];
			if( element.addEventListener ) {
				element.addEventListener(theEvent, functionCall , false );
			} else if( element.attachEvent ) {
			  	element.attachEvent( "on" + theEvent, functionCall );
			}
		}
	}
	
	
	this.createHiddenElement = function ( name , value ){
		var element = document.createElement("input");
		element.type = "hidden";
		element.name = name;
		element.value = value;
		return element;
	}
	
	
	
	/******************************************************
				Currency management
	 ******************************************************/
	
	this.currencySymbol = function() {		
		switch(this.currency){
			case JPY:
				return "&yen;";
				break;
			case EUR:
				return "&euro;";
				break;
			case GBP:
				return "&pound;";
				break;
			case USD:
			case CAD:
			case AUD:
			case NZD:
			case HKD:
			case SGD:
				return "&#36;";
				break;
			default:
				return "";
				break;
		}
	}
	
	
	this.currencyStringForPaypalCheckout = function( value ){
		if( this.currencySymbol == "&#36;" ){
			return "$" + parseFloat( value );
		} else {
			return "" + parseFloat(value );
		}
	}
	
	/******************************************************
				Formatting
	 ******************************************************/
	
	
	this.valueToCurrencyString = function( value ) {
		var currencyString = "" + parseFloat(value).toFixed(2);
		if( currencyString.length > 6 ){
			var newCurrencyString = "";
			for( var x=currencyString.length-1, placeValueCounter=1; x>=0;x--,placeValueCounter++){
				newCurrencyString = newCurrencyString + currencyString.substr(x,1);
				if( placeValueCounter == 3 ){
					if( x<currencyString.length-4 && x > 0 ) { newCurrencyString = newCurrencyString + ","; }
					placeValueCounter = 0;
				}
			}
			currencyString = newCurrencyString.reverse();
		}
		return this.currencySymbol() + currencyString;
	}
	
	this.valueToPercentageString = function( value ){
		return parseFloat( 100*value ).toFixed(0) + "%"
	}
	
	this.valueToImageString = function( value ){
		if( value.match(/<\s*img.*src\=/) ){
			return value;
		} else {
			return "<img src=\"" + value + "\" />";
		}
	}
	
	this.valueToTextInput = function( value , html ){
		return "<input type=\"text\" value=\"" + value + "\" " + html + " />";
	}
	
	this.valueToLink = function( value, link, html){
		return "<a href=\"" + link + "\" " + html + " >" + value + "</a>";
	}
	
	/******************************************************
				Duplicate management
	 ******************************************************/
	
	this.hasItem = function ( item ) {
		for( var current in this.items ) {
			var testItem = this.items[current];
			var matches = true;
			for( var field in item ){
				if( typeof( item[field] ) != "function"	&& 
					field != "quantity"  				&& 
					field != "id" 						){
					if( item[field] != testItem[field] ){
						matches = false;
					}
				}	
			}
			if( matches ){ 
				return current; 
			}
		}
		return false;
	}
	
	
	
	
	/******************************************************
				Cart Update managment
	 ******************************************************/
	
	this.update = function() {
		if( !simpleCart.isLoaded ){
			simpleCart.load();
		} 
		if( !simpleCart.pageIsReady ){
			simpleCart.initializeView();
		}
		this.updateTotals();
		this.updateView();
		this.save();
	}
	
	this.updateTotals = function() {
		this.total = 0 ;
		this.quantity  = 0;
		for( var current in this.items ){
			var item = this.items[current];
			if( item["quantity"] < 1 ){ 
				item.remove();
			} else if( item["quantity"] != null && item["quantity"] != "undefined" ){
				this.quantity = parseInt(this.quantity) + parseInt(item["quantity"]); 
			}
			if( item["price"] ){ 
				this.total = parseFloat(this.total) + parseInt(item["quantity"])*parseFloat(item["price"]); 
			}
		}
		this.shippingCost = parseFloat(this.total)*this.shippingRate;
		this.taxCost = parseFloat(this.total)*this.taxRate;
		this.finalTotal = this.shippingCost + this.taxCost + this.total;
	}
	
	this.initialize = function() {
		simpleCart.initializeView();
		simpleCart.load();
		simpleCart.update();
	}
				
}

/********************************************************************************************************
 *			Cart Item Object
 ********************************************************************************************************/

function CartItem() {
	this.id = "c" + NextId++;
	
	this.set = function ( field , value ){
		field = field.toLowerCase();
		if( typeof( this[field] ) != "function" && field != "id" ){
			if( field == "quantity" ){
				value = value.replace( /[^(\d|\.)]*/gi , "" );
				value = value.replace(/,*/gi, "");
				value = parseInt(value,10);
			} else if( field == "price"){
				value = value.replace( /[^(\d|\.)]*/gi, "");
				value = value.replace(/,*/gi , "");
				value = parseFloat( value );
			}
			if( typeof(value) == "number" && isNaN( value ) ){
				error( "Improperly formatted input.");
			} else {
				this[field] = value;
				this.checkQuantityAndPrice();
			}			
		} else {
			error( "Cannot change " + field + ", this is a reserved field.");
		}
		simpleCart.update();
	}
	
	this.increment = function(){
		this.quantity = parseInt(this.quantity) + 1;
		simpleCart.update();
	}
	
	this.decrement = function(){
		if( parseInt(this.quanity) < 2 ){
			this.remove();
		} else {
			this.quantity = parseInt(this.quantity) - 1;
			simpleCart.update();
		}
	}
	
	this.print = function () {
		var returnString = '';
		for( var field in this ) {
			if( typeof( this[field] ) != "function" ) {
				returnString+= escape(field) + "=" + escape(this[field]) + "||";
			}
		}
		return returnString.substring(0,returnString.length-2);
	}
	
	
	this.checkQuantityAndPrice = function() {
		if( this.quantity == null || this.quantity == 'undefined'){ 
			this.quantity = 1;
			error('No quantity for item.');
		} else {
			this.quantity = ("" + this.quantity).replace(/,*/gi, "" );
			this.quantity = parseInt( ("" + this.quantity).replace( /[^(\d|\.)]*/gi, "") ); 
			if( isNaN(this.quantity) ){
				error('Quantity is not a number.');
				this.quantity = 1;
			}
		}
				
		if( this.price == null || this.price == 'undefined'){
			this.price=0.00;
			error('No price for item or price not properly formatted.');
		} else {
			this.price = ("" + this.price).replace(/,*/gi, "" );
			this.price = +( ("" + this.price).replace( /[^(\d|\.)]*/gi, "") );
			if( isNaN(this.price) ){
				error('Price is not a number.');
				this.price = 0.00;
			}
		}
	}
	
	
	this.parseValuesFromArray = function( array ) {
		if( array && array.length && array.length > 0) {
			for(var x=0, xlen=array.length; x<xlen;x++ ){
			
				/* ensure the pair does not have key delimeters */
				array[x].replace(/||/, "| |");
				array[x].replace(/\+\+/, "+ +");
			
				/* split the pair and save the unescaped values to the item */
				var value = array[x].split('=');
				if( value.length>1 ){
					if( value.length>2 ){
						for(var j=2, jlen=value.length;j<jlen;j++){
							value[1] = value[1] + "=" + value[j];
						}
					}
					this[ unescape(value[0]).toLowerCase() ] = unescape(value[1]);
				}
			}
			return true;
		} else {
			return false;
		}
	}
	
	this.remove = function() {
		simpleCart.remove(this.id);
		simpleCart.update();
	}
	
}

/********************************************************************************************************
 *			Shelf Object for managing items on shelf that can be added to cart
 ********************************************************************************************************/

function Shelf(){
	this.items = new Array();
	
	this.readPage = function () {
		this.items = new Array();
		var newItems = getElementsByClassName( "simpleCart_shelfItem" );
		for( var current in newItems ){
			var newItem = new ShelfItem();
			this.checkChildren( newItems[current] , newItem );
			this.items[newItem.id] = newItem;
		}
	}
	
	this.checkChildren = function ( item , newItem) {
		
		for(var x=0;item.childNodes[x];x++){
			
			var node = item.childNodes[x];
			if( node.className && node.className.match(/item_/) ){
				
				var data=node.className.split('_');
				
				if( data[1] == "add" || data[1] == "Add" ){
					var tempArray = new Array();
					tempArray.push( node );
					simpleCart.addEventToArray( tempArray , simpleCart.Shelf.addToCart , "click");
					node.id = newItem.id;
				} else {
					newItem[data[1]]  = node;
				}
			}		
			if( node.childNodes[0] ){ 
				this.checkChildren( node , newItem );	
			}	
		}
	}
	
	this.empty = function () {
		this.items = new Array();
	}
	
	
	this.addToCart = function ( e ) {
		if(!e){
			var e = window.event;
		}
		var caller = e.target ? e.target : e.srcElement;
		simpleCart.Shelf.items[caller.id].addToCart();
	}
	
	
}

/********************************************************************************************************
 *			Shelf Item Object
 ********************************************************************************************************/


function ShelfItem(){
	
	this.id = "s" + NextId++;
	
	this.remove = function () {
		simpleCart.Shelf.items[this.id] = null;
	}
	
	
	this.addToCart = function () {
		var outStrings = new Array();
		for( var field in this ){
			if( typeof( this[field] ) != "function" && field != "id" ){
				var valueString = "";
				
				switch(field){
					case "price":
						if( this[field].value ){
							var valueString = this[field].value; 
						} else if( this[field].innerHTML ) {
							var valueString = this[field].innerHTML;
						}
						/* remove all characters from price except digits and a period */
						valueString = valueString.replace( /[^(\d|\.)]*/gi , "" );
						valueString = valueString.replace( /,*/ , "" );
						break;
					case "image":
						valueString = this[field].src;
						break;
					default:
						if( this[field].value ){
							var valueString = this[field].value; 
						} else if( this[field].innerHTML ) {
							var valueString = this[field].innerHTML;
						} else if( this[field].src ){
							var valueString = this[field].src;
						} else {
							var valueString = this[field];
						}
						break;
				}
				outStrings.push( field + "=" + valueString );
			}
		}
		
		simpleCart.add( outStrings );
	}
	
}







/********************************************************************************************************
 * Thanks to Peter-Paul Koch for these cookie functions (http://www.quirksmode.org/js/cookies.html)
 ********************************************************************************************************/
function createCookie(name,value,days) {
	if (days) {
		var date = new Date();
		date.setTime(date.getTime()+(days*24*60*60*1000));
		var expires = "; expires="+date.toGMTString();
	}
	else var expires = "";
	document.cookie = name+"="+value+expires+"; path=/";
}

function readCookie(name) {
	var nameEQ = name + "=";
	var ca = document.cookie.split(';');
	for(var i=0;i < ca.length;i++) {
		var c = ca[i];
		while (c.charAt(0)==' ') c = c.substring(1,c.length);
		if (c.indexOf(nameEQ) == 0) return c.substring(nameEQ.length,c.length);
	}
	return null;
}

function eraseCookie(name) {
	createCookie(name,"",-1);
}


//*************************************************************************************************
/*
	Developed by Robert Nyman, http://www.robertnyman.com
	Code/licensing: http://code.google.com/p/getelementsbyclassname/
*/	
var getElementsByClassName = function (className, tag, elm){
	if (document.getElementsByClassName) {
		getElementsByClassName = function (className, tag, elm) {
			elm = elm || document;
			var elements = elm.getElementsByClassName(className),
				nodeName = (tag)? new RegExp("\\b" + tag + "\\b", "i") : null,
				returnElements = [],
				current;
			for(var i=0, il=elements.length; i<il; i+=1){
				current = elements[i];
				if(!nodeName || nodeName.test(current.nodeName)) {
					returnElements.push(current);
				}
			}
			return returnElements;
		};
	}
	else if (document.evaluate) {
		getElementsByClassName = function (className, tag, elm) {
			tag = tag || "*";
			elm = elm || document;
			var classes = className.split(" "),
				classesToCheck = "",
				xhtmlNamespace = "http://www.w3.org/1999/xhtml",
				namespaceResolver = (document.documentElement.namespaceURI === xhtmlNamespace)? xhtmlNamespace : null,
				returnElements = [],
				elements,
				node;
			for(var j=0, jl=classes.length; j<jl; j+=1){
				classesToCheck += "[contains(concat(' ', @class, ' '), ' " + classes[j] + " ')]";
			}
			try	{
				elements = document.evaluate(".//" + tag + classesToCheck, elm, namespaceResolver, 0, null);
			}
			catch (e) {
				elements = document.evaluate(".//" + tag + classesToCheck, elm, null, 0, null);
			}
			while ((node = elements.iterateNext())) {
				returnElements.push(node);
			}
			return returnElements;
		};
	}
	else {
		getElementsByClassName = function (className, tag, elm) {
			tag = tag || "*";
			elm = elm || document;
			var classes = className.split(" "),
				classesToCheck = [],
				elements = (tag === "*" && elm.all)? elm.all : elm.getElementsByTagName(tag),
				current,
				returnElements = [],
				match;
			for(var k=0, kl=classes.length; k<kl; k+=1){
				classesToCheck.push(new RegExp("(^|\\s)" + classes[k] + "(\\s|$)"));
			}
			for(var l=0, ll=elements.length; l<ll; l+=1){
				current = elements[l];
				match = false;
				for(var m=0, ml=classesToCheck.length; m<ml; m+=1){
					match = classesToCheck[m].test(current.className);
					if (!match) {
						break;
					}
				}
				if (match) {
					returnElements.push(current);
				}
			}
			return returnElements;
		};
	}
	return getElementsByClassName(className, tag, elm);
};


/********************************************************************************************************
 * String Reverse function (thanks to shachi and bytemycode.com - 
		http://www.bytemycode.com/snippets/snippet/400 ) 
 ********************************************************************************************************/


String.prototype.reverse = function(){
	splitext = this.split("");
	revertext = splitext.reverse();
	reversed = revertext.join("");
	return reversed;
}


/********************************************************************************************************
 * error management 
 ********************************************************************************************************/


function error( string ) {
	alert( "Error: " + string );
}

var simpleCart = new Cart();

window.onload = simpleCart.initialize;