// javascript rollover stuff 

  browserName = navigator.appName;
  browserVer = parseInt(navigator.appVersion);
  
  if (((browserName == "Netscape") && (browserVer >= 3)) || ((browserName == "Microsoft Internet Explorer") && (browserVer >= 4))) {
    version = "ok";

    home_on = new Image;   home_on.src = "images/home-on.gif";
    home_off = new Image;  home_off.src = "images/home-off.gif";

    registration_on = new Image;   registration_on.src = "images/registration-on.gif";
    registration_off = new Image;  registration_off.src = "images/registration-off.gif";    

    agenda_on = new Image;   agenda_on.src = "images/agenda-on.gif";
    agenda_off = new Image;  agenda_off.src = "images/agenda-off.gif";

    speakers_on = new Image;   speakers_on.src = "images/speakers-on.gif";
    speakers_off = new Image;  speakers_off.src = "images/speakers-off.gif";

    accommodations_on = new Image;   accommodations_on.src = "images/accommodations-on.gif";
    accommodations_off = new Image;  accommodations_off.src = "images/accommodations-off.gif";

    visitor_info_on = new Image;   visitor_info_on.src = "images/visitor_info-on.gif";
    visitor_info_off = new Image;  visitor_info_off.src = "images/visitor_info-off.gif";    

    contact_us_on = new Image;   contact_us_on.src = "images/contact_us-on.gif";
    contact_us_off = new Image;  contact_us_off.src = "images/contact_us-off.gif";

    
  }
  else 
    version = "x";

  function img_on(imgName) {
    if (version == "ok") {
       imgOn = eval(imgName + "_on.src");
       document [imgName].src = imgOn;
    }
  }
  function img_off(imgName) {
    if (version == "ok") {
      imgOff = eval(imgName + "_off.src");
      document [imgName].src = imgOff;
    }
  }