var tabCount = 3;

function enable(x){

	// aktiven ausblenden
	$$('div.tabbuttonOn').each(function(item) {
		item.removeClassName('tabbuttonOn');
		item.addClassName('tabbuttonOff');
		
		// aktiven conten ebenfalls ausblenden -> REFACTOR ME
		$('rankingTabContent' + item.readAttribute('id').substr(10,1)).style.display='none';
	});
	
	$('rankingTab' + x).removeClassName('tabbuttonOff');;
	$('rankingTab' + x).addClassName('tabbuttonOn');;

	$('rankingTabContent' + x).style.display='block';
	
	// hidden field fuellen
	document.getElementById('activeTab').value = x;	
}