function hideLayer(layerName) {
  if(document.getElementById) {  //DOM
     document.getElementById(layerName).style.visibility = 'hidden';
     document.getElementById(layerName).style.display = 'none';
  }
  else
  if(document.all) {  //IE
     document.all[layerName].style.visibility = 'hidden';
     document.all[layerName].style.display = 'none';
  }
  else
  if(document.layers) {  //Netscape4.x ohne Garantie
     document.layers[layerName].style.visibility = 'hidden';
     document.layers[layerName].style.display = 'none';
  }
}

function showLayer(layerName) {
  if(document.getElementById) {  //DOM
     document.getElementById(layerName).style.visibility = 'visible';
     document.getElementById(layerName).style.display = 'inline';
  }
  else
  if(document.all) {  //IE
     document.all[layerName].style.visibility = 'visible';
     document.all[layerName].style.display = 'inline';
  }
  else  //Netscape4.x ohne Garantie
  if(document.layers) {
     document.layers[layerName].style.visibility = 'visible';
     document.layers[layerName].style.display = 'inline';
  }
}

function toggleLayer(layerSavedName) {
   if (show[layerSavedName]==1) {
      hideLayer(layerSavedName);
	  show[layerSavedName] = 0;
   }
   else  {
      showLayer(layerSavedName);
	  show[layerSavedName] = 1;
   }
}