function zobrazsubmenu(active)
{
if(!document.getElementById("submenu-nadace")) return;

ar=Array('nadace', 'expedice', 'forum');

for(key in ar)
{
if(!document.getElementById('submenu-' + ar[key])) continue;

if(ar[key] == active)
{
document.getElementById('submenu-' + ar[key]).style.display='block';
}
else
{
document.getElementById('submenu-' + ar[key]).style.display='none';
}
}
}