window.addEvent('domready', function(){
									 
	// POKUD JSOU DEFINOVANY TABY
	if($defined($('tabs'))) {
		$('tabs-nav').getElements('a').addEvent('click', function(event){
			event.stop();
			Tab(this);
		});	
	}
	
	// KDYZ EXAM ODPOVEDI - prida rollover
	if($defined($('exam_answers'))) {
		$('exam_answers').getElements('label').addEvents({
			'mouseover': function(){
				this.addClass('q_hover');
			},
			'mouseout': function(){
				this.removeClass('q_hover');
			}
		});
	}
	
	var Tab = function(tab) {
		// odebrat active class ze vsech tabu v menu
		$('tabs-nav').getElements('a').removeClass('active');
		// pridat active class do aktualni tabu
		tab.addClass('active');

		// schovat stary content
		$('tabs-content').getElements('div[class^=tab]').setStyle('display', 'none');
	    $('tabs-content').setStyle('height', 'auto')

		var height = $('tabs-content').getElementById(tab.rev).setStyle('display', 'block').getHeight();
		
		var changeEffect = new Fx.Elements($('tabs-content'), {duration: 1000, transition: Fx.Transitions.Bounce.easeOut});
		changeEffect.start({
			'0': {'height': [0, height]}
		});
	}
});