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

  if (browserName == "Netscape" && browserVer >= 3) version = "yes";
          else {if (browserName == "Microsoft Internet Explorer" && browserVer >= 3) version = "yes";
                    else version = "no";}
          if (version == "yes") 
          { 
            rent = new Image();
            rent.src = "images/buttons/welcometorental.gif";
            renta = new Image();
            renta.src = "images/buttons/welcometorentala.gif";

            sale = new Image();
            sale.src = "images/buttons/welcometosales.gif";
            salea = new Image();
            salea.src = "images/buttons/welcometosalesa.gif";

           }

    function displayOver(objectName) 
    {
      if (version == "yes") 
      {
        imgOn = eval(objectName + "a.src");
        document [objectName].src = imgOn;
      }
    }

    function displayOut(objectName) 
    {
      if (version == "yes") 
      {
        imgOff = eval(objectName + ".src");
        document [objectName].src = imgOff;
      }
    }