function klappunter(untermenu)
{ 
var GECKO = document.getElementById? 1:0 ;
var NS = document.layers? 1:0 ;
var IE = document.all? 1:0 ;
if (GECKO) {
document.getElementById(untermenu).style.display= (document.getElementById(untermenu).style.display=='block') ? 'none' : 'block';
for(var v = 0; v < 1; v++) {
var zaehle = 'w' + v; 
if(untermenu != zaehle) { 
document.getElementById(zaehle).style.display = 'none'; 
} 
} 
} 
else if (NS) {
document.layers[untermenu].display=(document.layers[untermenu].display== 'block') ? 'none' : 'block';
for(var v = 0; v < 1; v++) {
var zaehle = 'w' + v; 
if(untermenu != zaehle) { 
document.layers[zaehle].display = 'none'; 
} 
} 
} 
else if (IE) {
document.all[untermenu].style.display=(document.all[untermenu].style.display== 'block') ? 'none' : 'block';
for(var v = 0; v < 1; v++) {
var zaehle = 'w' + v; 
if(untermenu != zaehle) { 
document.all[zaehle].style.display = 'none'; 
} 
} 
}
}