var browserType;

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

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

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

<!-- Begin Script
var progressEnd = 20; // set to number of progress <span>'s.
var progressColor = 'blue'; // set to progress bar color
var progressInterval = 500; // set to time between updates (milli-seconds)

var progressAt = progressEnd;
var progressTimer;
function progress_clear() {
for (var i = 1; i <= progressEnd; i++) document.getElementById('progress'+i).style.backgroundColor = 'transparent';
progressAt = 0;
}
function progress_update() {
progressAt++;
if (progressAt > progressEnd) progress_clear();
else document.getElementById('progress'+progressAt).style.backgroundColor = progressColor;
progressTimer = setTimeout('progress_update()',progressInterval);
}
function progress_stop() {
clearTimeout(progressTimer);
progress_clear();
}
// End -->