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/top_home_off.jpg";
   home_on = new Image();
   home_on.src = "../images/navigation/top_home_on.jpg";

   aboutus_off = new Image();
   aboutus_off.src = "../images/navigation/button_aboutus_off.gif";
   aboutus_on = new Image();
   aboutus_on.src = "../images/navigation/button_aboutus_on.gif";

   services_off = new Image();
   services_off.src = "../images/navigation/button_services_off.gif";
   services_on = new Image();
   services_on.src = "../images/navigation/button_services_on.gif";

   projects_off = new Image();
   projects_off.src = "../images/navigation/button_projects_off.gif";
   projects_on = new Image();
   projects_on.src = "../images/navigation/button_projects_on.gif";

   resources_off = new Image();
   resources_off.src = "../images/navigation/button_resources_off.gif";
   resources_on = new Image();
   resources_on.src = "../images/navigation/button_resources_on.gif";

   feedback_off = new Image();
   feedback_off.src = "../images/navigation/button_feedback_off.gif";
   feedback_on = new Image();
   feedback_on.src = "../images/navigation/button_feedback_on.gif";

   contactus_off = new Image();
   contactus_off.src = "../images/navigation/button_contactus_off.gif";
   contactus_on = new Image();
   contactus_on.src = "../images/navigation/button_contactus_on.gif";
}
function imgAct(imgName) {
   if (br== "aware") {
      document.images[imgName].src=eval(imgName + "_on.src");
   }
}
function imgInact(imgName) {
   if (br== "aware") {
      document.images[imgName].src=eval(imgName + "_off.src");
   }
}