var ie4 = false;
 if(document.all) { ie4 = true; }

 function getObject(id) {
	 if (ie4) {
		 return document.all[id];
	 } else {
	 	return document.getElementById(id);
	 } 
 }

 function toggleStay(link, divId) {
	var d = getObject(divId);

	if (d.style.display == 'none') {
		d.style.display = 'block';
	} else {
		d.style.display = 'none';
	}
 }

 function toggle(link, divId) {
	var lText = link.innerHTML;
	var d = getObject(divId);

	if (lText == '[+]') {
		link.innerHTML = '[−]';
		d.style.display = 'block';
	} else {
		link.innerHTML = '[+]';
		d.style.display = 'none';
	}
 }

 function toggleVerfuegbarkeit(link, divId) {
	var lText = link.innerHTML;
	var d = getObject(divId);

	if (lText == 'Verfügbarkeit überprüfen') {
		link.innerHTML = 'Reservierung Abbrechen';
		d.style.display = 'block';
		document.getElementById('buchungsframe').width = '720';
		document.getElementById('buchungsframe').height = '550';
		document.getElementById('buchungsframe').src = 'http://www.key-res.com/reserve.php?mstcode=BER4815&sh=no&lang=de';
	} else {
		link.innerHTML = 'Verfügbarkeit überprüfen';
		document.getElementById('buchungsframe').width = '0';
		document.getElementById('buchungsframe').height = '0';
		document.getElementById('buchungsframe').src = '#';
		d.style.display = 'none';
	}  
 }

 function toggleBuchen(link, divId) {
	var lText = link.innerHTML;
	var d = getObject(divId);

	if (lText == 'Jetzt Buchen!') {
		link.innerHTML = 'Reservierung Abbrechen';
		d.style.display = 'block';
		document.getElementById('buchungsframe').width = '720';
		document.getElementById('buchungsframe').height = '550';
		document.getElementById('buchungsframe').src = 'http://www.key-res.com/reserve.php?mstcode=BER4815&sh=no&lang=de';
	} else {
		link.innerHTML = 'Jetzt Buchen!';
		document.getElementById('buchungsframe').width = '0';
		document.getElementById('buchungsframe').height = '0';
		document.getElementById('buchungsframe').src = '#';
		d.style.display = 'none';
	}  
 }