function anzeigen_img(id){

 var img = 'img_' + id;
 if(document.getElementById(id).style.display == 'none')
 {
 document.getElementById(id).style.display = 'block';
 document.getElementById(img).src = 'grafik/opened.png';
 }
 else 
 {
 document.getElementById(id).style.display = 'none';
 document.getElementById(img).src = 'grafik/closed.png';
 } 

}

function anzeigen(menue){

 if(document.getElementById(menue).style.display == 'none')
 {
 document.getElementById(menue).style.display = 'block';
 
 }
 else 
 {
 document.getElementById(menue).style.display = 'none';
 
 } 

}