function addFavoritos(id,promo){			
		
		new Ajax.Request('favoritos.php', {
			method: 'post',
			postBody: 'opcion=add&id=' + id + '&promo=' + promo,
			onSuccess: addFavoritosOk,
			onFailure: errFunc

		});
	}
	
	function addFavoritosOk(t) {
	
		var divFavoritos = document.getElementById('favoritos');		
		var xml = t.responseXML;
		var existe = xml.getElementsByTagName('existe')[0].childNodes[0].data;
		var html = xml.getElementsByTagName('html')[0].childNodes[0].data;
		
		if (existe != "") 
		
			alert(existe);
		else 
		
			divFavoritos.innerHTML = html;
	}
	
	
	function delFavoritos(id,promo){			
					
		new Ajax.Request('favoritos.php', {
			method: 'post',
			postBody: 'opcion=del&id=' + id + '&promo=' + promo,
			onSuccess: delFavoritosOk,
			onFailure: errFunc
		});
	}
	
	function delFavoritosOk(t) {
	
		var divFavoritos = document.getElementById('favoritos');
		
		var xml = t.responseXML;
		var existe = xml.getElementsByTagName('existe')[0].childNodes[0].data;
		var html = xml.getElementsByTagName('html')[0].childNodes[0].data;
		
		divFavoritos.innerHTML = html;
		
		//alert(t.responseText);
	}
	
	
	
	function errFunc(t) {
		
		alert(t.responseText);
	}