browserR = (((navigator.appName == "Netscape") && (parseInt(navigator.appVersion) >= 3 )) || ((navigator.appName == "Microsoft Internet Explorer") && (parseInt(navigator.appVersion) >= 4 )))

if (browserR){
  nav1_off = new Image;
  nav1_off.src = "images/nav1.gif";
  nav1_on = new Image;
  nav1_on.src = "images/nav1_over.gif";
  
  nav2_off = new Image;
  nav2_off.src = "images/nav2.gif";
  nav2_on = new Image;
  nav2_on.src = "images/nav2_over.gif";
  
  nav3_off = new Image;
  nav3_off.src = "images/nav3.gif";
  nav3_on = new Image;
  nav3_on.src = "images/nav3_over.gif";
  
  nav4_off = new Image;
  nav4_off.src = "images/nav4.gif";
  nav4_on = new Image;
  nav4_on.src = "images/nav4_over.gif";
  
  nav5_off = new Image;
  nav5_off.src = "images/nav5.gif";
  nav5_on = new Image;
  nav5_on.src = "images/nav5_over.gif";
  
  nav6_off = new Image;
  nav6_off.src = "images/nav6.gif";
  nav6_on = new Image;
  nav6_on.src = "images/nav6_over.gif";
  
  nav6_off = new Image;
  nav6_off.src = "images/nav6.gif";
  nav6_on = new Image;
  nav6_on.src = "images/nav6_over.gif";
  
  nav7_off = new Image;
  nav7_off.src = "images/nav7.gif";
  nav7_on = new Image;
  nav7_on.src = "images/nav7_over.gif";
  
  nav8_off = new Image;
  nav8_off.src = "images/nav8.gif";
  nav8_on = new Image;
  nav8_on.src = "images/nav8_over.gif";
  
  nav9_off = new Image;
  nav9_off.src = "images/nav9.gif";
  nav9_on = new Image;
  nav9_on.src = "images/nav9_over.gif";
}