bName = navigator.appName;
bVersion = parseInt(navigator.appVersion);
if ((bName == "Netscape" && bVersion >= 3) || (bName == "Microsoft Internet Explorer" && bVersion >= 4)) br = "aware";
else br = "unaware"; 

if (br== "aware") {
   home_off = new Image();
   home_off.src = "../images/navigation/home_out.gif";
   home_on = new Image();
   home_on.src = "../images/navigation/home_over.gif";

   activities_off = new Image();
   activities_off.src = "../images/navigation/activities_out.gif";
   activities_on = new Image();
   activities_on.src = "../images/navigation/activities_over.gif";

   collection_off = new Image();
   collection_off.src = "../images/navigation/collection_out.gif";
   collection_on = new Image();
   collection_on.src = "../images/navigation/collection_over.gif";

   publications_off = new Image();
   publications_off.src = "../images/navigation/publications_out.gif";
   publications_on = new Image();
   publications_on.src = "../images/navigation/publications_over.gif";

   resources_off = new Image();
   resources_off.src = "../images/navigation/resources_out.gif";
   resources_on = new Image();
   resources_on.src = "../images/navigation/resources_over.gif";

   volunteers_off = new Image();
   volunteers_off.src = "../images/navigation/volunteers_out.gif";
   volunteers_on = new Image();
   volunteers_on.src = "../images/navigation/volunteers_over.gif";

   membership_off = new Image();
   membership_off.src = "../images/navigation/membership_out.gif";
   membership_on = new Image();
   membership_on.src = "../images/navigation/membership_over.gif";

   site_map_off = new Image();
   site_map_off.src = "../images/navigation/site_map_out.gif";
   site_map_on = new Image();
   site_map_on.src = "../images/navigation/site_map_over.gif";

}
function imageOn(imageName) {
   if (br== "aware") {
      document.images[imageName].src=eval(imageName + "_on.src");
   }
}
function imageOff(imageName) {
   if (br== "aware") {
      document.images[imageName].src=eval(imageName + "_off.src");
   }
}