var openmenu = 0;

function mitte(breite) {
  if (navigator.appName == "Microsoft Internet Explorer")
    return document.getElementById('layout').style.left = ((screen.width-breite)/2-11)+'px';
  if (navigator.appName == "Opera")
    return document.getElementById('layout').style.left = ((screen.width-breite)/2-27)+'px';
  else
    return document.getElementById('layout').style.left = ((screen.width-breite)/2-8)+'px';
}

function popup (url) {
 fenster = window.open(url, "", "width=400,height=200,resizable=no");
 fenster.focus();
 return false;
}

function opennavi_s(menu){
  openmenu = menu;
  document.getElementById('navi_studio').style.visibility = 'visible';

  if (document.getElementById('navi_live').style.visibility == 'visible')
    document.getElementById('navi_live').style.visibility = 'hidden';
  if (document.getElementById('navi_compilations').style.visibility == 'visible')
    document.getElementById('navi_compilations').style.visibility = 'hidden';
  if (document.getElementById('navi_sonstiges').style.visibility == 'visible')
    document.getElementById('navi_sonstiges').style.visibility = 'hidden';
}

function closenavi(menu){
  if (openmenu == 1) { document.getElementById('navi_studio').style.visibility = 'hidden';  }
  if (openmenu == 2) { document.getElementById('navi_live').style.visibility = 'hidden'; }
  if (openmenu == 3) { document.getElementById('navi_compilations').style.visibility = 'hidden'; }
  if (openmenu == 4) { document.getElementById('navi_sonstiges').style.visibility = 'hidden'; }
  openmenu = menu;
}

function opennavi_l(menu){
  openmenu = menu;
  document.getElementById('navi_live').style.visibility = 'visible';

  if (document.getElementById('navi_studio').style.visibility == 'visible')
    document.getElementById('navi_studio').style.visibility = 'hidden';
  if (document.getElementById('navi_compilations').style.visibility == 'visible')
    document.getElementById('navi_compilations').style.visibility = 'hidden';
  if (document.getElementById('navi_sonstiges').style.visibility == 'visible')
    document.getElementById('navi_sonstiges').style.visibility = 'hidden';
}

function opennavi_c(menu){
  openmenu = menu;
  document.getElementById('navi_compilations').style.visibility = 'visible';

  if (document.getElementById('navi_studio').style.visibility == 'visible')
    document.getElementById('navi_studio').style.visibility = 'hidden';
  if (document.getElementById('navi_live').style.visibility == 'visible')
    document.getElementById('navi_live').style.visibility = 'hidden';
  if (document.getElementById('navi_sonstiges').style.visibility == 'visible')
    document.getElementById('navi_sonstiges').style.visibility = 'hidden';
}

function opennavi_o(menu){
  openmenu = menu;
  document.getElementById('navi_sonstiges').style.visibility = 'visible';

  if (document.getElementById('navi_studio').style.visibility == 'visible')
    document.getElementById('navi_studio').style.visibility = 'hidden';
  if (document.getElementById('navi_live').style.visibility == 'visible')
    document.getElementById('navi_live').style.visibility = 'hidden';
  if (document.getElementById('navi_compilations').style.visibility == 'visible')
    document.getElementById('navi_compilations').style.visibility = 'hidden';
}