function addToCart(id,clase,action){
	if(!action){
		action='';
	}
	
	var f = document.createElement('form');
	f.setAttribute('id', id);
	f.setAttribute('method', "POST");
	f.setAttribute('action',action);

	var idItem = document.createElement("input");
   idItem.setAttribute("type", "text");
   idItem.setAttribute("name", "id_item_carrito");
   idItem.setAttribute("value",String(id));
   f.appendChild(idItem);
   
   var idClase = document.createElement("input");
   idClase.setAttribute("type", "hidden");
   idClase.setAttribute("name", "clase_carrito");
   idClase.setAttribute("value", String(clase));
   f.appendChild(idClase);
   
   var body = document.getElementsByTagName("body")[0]
   body.appendChild(f);
   f.submit();
}