if(navigator.appName == "Netscape")
   {
    //alert("You're using a Netscape browser.")
    document.getElementById("browshgt").className="heightNet";
   }
   else if(navigator.appName == "Opera")
   {
    document.getElementById("browshgt").className="heightOpera";
    //alert("You're using a Opera browser.")
   }
   else
   {
    document.getElementById("browshgt").className="heightIE";
    //alert("You're using a IE browser.")
   }