function show(box, element) {
	if (box=='nachrichten') {
		element.className = "nachrichten_act";
		document.getElementById('podcast_link').className = "podcast";
		document.getElementById('nachrichten').style.display = "block";
		document.getElementById('podcast').style.display = "none";
	}
	if (box=='podcast') {
		element.className = "podcast_act";
		document.getElementById('nachrichten_link').className = "nachrichten";
		document.getElementById('nachrichten').style.display = "none";
		document.getElementById('podcast').style.display = "block";	
	}
	if (box=='podcast_lautsprecher') {
		document.getElementById('podcast_link').className = "podcast_act";
		document.getElementById('nachrichten_link').className = "nachrichten";
		document.getElementById('nachrichten').style.display = "none";
		document.getElementById('podcast').style.display = "block";	
	}
}