var browserType;
if (document.layers) {browserType = "nn4"}
if (document.all) {browserType = "ie"}
if (window.navigator.userAgent.toLowerCase().match("gecko")) 
{
   browserType= "gecko"
}

function hide(divName) 
{
  if (browserType == "gecko" )
     document.poppedLayer = 
         eval('document.getElementById(divName)');
  else if (browserType == "ie")
     document.poppedLayer = 
        eval('document.getElementById(divName)');
  else
     document.poppedLayer =   
        eval('document.layers[divName]');
  document.poppedLayer.style.visibility = "hidden";
}

function show(divName) 
{
  if (browserType == "gecko" )
     document.poppedLayer = 
         eval('document.getElementById(divName)');
  else if (browserType == "ie")
     document.poppedLayer = 
        eval('document.getElementById(divName)');
  else
     document.poppedLayer = 
         eval('document.layers[divName]');
  document.poppedLayer.style.visibility = "visible";
}