function mytheme_preprocess (&$variables, $hook) {
 
	//print_r(menu_navigation_links('menu-logos'));
 
	$url = $_GET['q'];
 
    $urls1 = array('node/12','node/13','node/14');
 
	if (in_array($url,$urls1)) {
 
		menu_set_active_item('node/12');
 
		}
 
	$urls2 = array('node/1','node/2','node/3','node/4','node/5','node/6');
 
	if (in_array($url,$urls2)) {
 
		menu_set_active_item('node/1');
 
		}
 
 
 
	}