GECKO = document.getElementById? 1:0 ;
NS = document.layers? 1:0 ;
IE = document.all? 1:0 ;

function haupt(untermenue)
{ 
var hauptmenues = new Array('willkommen','fotowettbewerb','bildergalerie','weinbau_d','weinbau_e','weinbau_u');

for (var menue in hauptmenues) 
{ 
var das_menue = hauptmenues[menue]; 
if (GECKO) {document.getElementById(das_menue).style.display = 'none';}
else if (NS) {document.layers[das_menue].style.display = 'none';} 
else if (IE) {document.all[das_menue].style.display = 'none';}
}

aufklappen(untermenue);
}

function aufklappen(untermenue)
{
if (GECKO) {document.getElementById(untermenue).style.display = 'block';}
else if (NS) {document.layers[untermenue].style.display = 'block';}
else if (IE) {document.all[untermenue].style.display = 'block';}
}

function zuklappen(untermenue)
{
if (GECKO) {document.getElementById(untermenue).style.display = 'none';}
else if (NS) {document.layers[untermenue].style.display = 'none';}
else if (IE) {document.all[untermenue].style.display = 'none';}
}