Observer.php

<?php
/**
 * @package  anc_album
 * @category magento
 * @mailto	code [at] netz.coop
 * @author	netz.coop eG* 
 * @copyright (c) 2014, netz.coop eG
 * 
 *   This program is free software: you can redistribute it and/or modify
 *   it under the terms of the GNU General Public License as published by
 *   the Free Software Foundation, either version 3 of the License, or
 *  (at your option) any later version.
 *
 *   This program is distributed in the hope that it will be useful,
 *   but WITHOUT ANY WARRANTY; without even the implied warranty of
 *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 *   GNU General Public License for more details.
 *
 *   You should have received a copy of the GNU General Public License
 *   along with this program.  If not, see <http://www.gnu.org/licenses/>.
 * 
 */ 

class Anc_Album_Model_Observer {

	public function checkncalbumjokercategory(Varien_Event_Observer $param_param) {
		$SelectedCategoryNcAlbumModel = Mage::helper('anc_album/nccategory')->getSelectedCategoryNcAlbumModelByUrl();
		if(is_object($SelectedCategoryNcAlbumModel)) {
			Mage::getSingleton('checkout/session')->setSelectedCategoryNcAlbumModel($SelectedCategoryNcAlbumModel);
		}
	}
}