browserName = navigator.appName;
browserVer = parseInt(navigator.appVersion);

if (browserName == "Netscape" && browserVer >= 3) 
{
  version = "n3";
} 

else 
{
  version = "n2";
}

if (browserName == "Microsoft Internet Explorer" && browserVer >= 4) 
{
  version = "n3";
}

if(version == "n3") 
{
  AboutMain_on = new Image();
  AboutMain_on.src = "../MenuMain/AboutLRbuttonOVER.gif";
  AboutMain_off = new Image();
  AboutMain_off.src = "../MenuMain/AboutLRbuttonOFF.gif";
  
  RecMain_on = new Image();
  RecMain_on.src = "../MenuMain/RecbuttonOVER.gif";
  RecMain_off = new Image();
  RecMain_off.src = "../MenuMain/RecbuttonOFF.gif";
  
  EnvMain_on = new Image();
  EnvMain_on.src = "../MenuMain/EnvbuttonOVER.gif";
  EnvMain_off = new Image();
  EnvMain_off.src = "../MenuMain/EnvbuttonOFF.gif";
  
  EdMain_on = new Image();
  EdMain_on.src = "../MenuMain/EdbuttonOVER.gif";
  EdMain_off = new Image();
  EdMain_off.src = "../MenuMain/EdbuttonOFF.gif";
  
  }

function highlight(imgName) 
{
  if(version=="n3") 
    {
      imgOn = eval (imgName + "_on.src");
      document [imgName].src = imgOn;
    }
}

function unhighlight(imgName) 
{
  if(version=="n3") 
    {
      imgOff = eval (imgName + "_off.src");
      document [imgName].src = imgOff;
    }
}