Event.observe(window, 'load', init, false);

function init() {
	teaser = $$('div.glider_teaser');
	teaser.each(function(news, index) {
	  news.hide();
	});	
	tabs = new Control.Tabs('news_nav', 
							{ activeClassName:"selected_teaser", afterChange: function(new_container) { new_container.style.opacity=1}}
						   );

	new PeriodicalExecuter( function(e){
								if (tabs.activeContainer && tabs.hasNext()){
									new Effect.Opacity(tabs.activeContainer, {duration:2, from:1, to:0, afterFinish: function(){tabs.next()}})

								}
							}
							,20)
}