/**
 *	Agrega un producto al carrito de compras.
 */
function addToCart(code,description,unit_price,imageObject) {
	
	var req = new Request.JSON({	
					url: 'addToCart.php',
					encoding:"iso-8859-1",
					urlEncoded : false,
					onComplete :  function(object){
									var img = imageObject;
									img.src = 'images/shopping_cart.gif';
								  },
					headers : {
								 "Content-Type" : "application/json; charset=ISO-8859-1;"
						 	  },
					onFailure : function(object){
									var img = imageObject;
									img.src = 'images/shopping_cart.gif';
									alert('Hubo un error al agregar el producto al carrito de compras.');
								},
					onException : function(object){
								  	var img = imageObject;
									img.src = 'images/shopping_cart.gif';
									alert('Hubo un error al agregar el producto al carrito de compras.');
								  }
								});
	
	imageObject.src = 'images/loading.gif';
	
	data = { "code" : code, "description" : description , "unit_price" : unit_price};
		
	req.send(JSON.encode(data));
	
}