function displayDiv(id){

 var img = 'img_' + id;
 if(document.getElementById(id).style.display == 'none')
 {
  document.getElementById(id).style.display = 'block';
  document.getElementById(img).src = 'fileadmin/templates/gfx/arrup.gif'; // Grafik referenzieren
 }
 else
 {
  document.getElementById(id).style.display = 'none';
  document.getElementById(img).src = 'fileadmin/templates/gfx/arrdown.gif'; // Grafik referenzieren
 }
}

function displayNextImg(id){
	var imgdiv = 'imgdiv' + id;
	var nextid = id+1;
	var imgnext = 'imgdiv' + nextid;
	document.getElementById(imgdiv).style.display = 'none';
	document.getElementById(imgnext).style.display = 'block';
}

function displayPrevImg(id){
	var imgdiv = 'imgdiv' + id;
	var previd = id-1;
	var imgnext = 'imgdiv' + previd;
	document.getElementById(imgdiv).style.display = 'none';
	document.getElementById(imgnext).style.display = 'block';
}