browserName = navigator.appName;
browserVer = parseInt(navigator.appVersion);
   version = "no";
   if (browserName == "Netscape" && browserVer >= 3) version = "ok";
   if (browserName == "Microsoft Internet Explorer" && browserVer >= 4) version = "ok";
if (version == "ok")
{
  menu1on = new Image();
  menu1on.src = "http://www.microdent.pl/img/menu1_.gif";
  menu1off = new Image();
  menu1off.src = "http://www.microdent.pl/img/menu1.gif";

  menu2on = new Image();
  menu2on.src = "http://www.microdent.pl/img/menu2_.gif";
  menu2off = new Image();
  menu2off.src = "http://www.microdent.pl/img/menu2.gif";

  menu3on = new Image();
  menu3on.src = "http://www.microdent.pl/img/menu3_.gif";
  menu3off = new Image();
  menu3off.src = "http://www.microdent.pl/img/menu3.gif";

  menu4on = new Image();
  menu4on.src = "http://www.microdent.pl/img/menu4_.gif";
  menu4off = new Image();
  menu4off.src = "http://www.microdent.pl/img/menu4.gif";

  menu5on = new Image();
  menu5on.src = "http://www.microdent.pl/img/menu5_.gif";
  menu5off = new Image();
  menu5off.src = "http://www.microdent.pl/img/menu5.gif";

  menu6on = new Image();
  menu6on.src = "http://www.microdent.pl/img/menu6_.gif";
  menu6off = new Image();
  menu6off.src = "http://www.microdent.pl/img/menu6.gif";

}
function select(imgName) 
{
  if (version == "ok")
  {
    imgOn = eval(imgName + "on.src");
    document [imgName].src = imgOn;
  }
}
function deselect(imgName) 
{
  if (version == "ok")
  {
    imgOff = eval(imgName + "off.src");
    document [imgName].src = imgOff;
  }
}