browserName = navigator.appName;
browserVer = parseInt(navigator.appVersion);

if ((browserName == "Netscape" && browserVer >= 3)||
  (browserName == "Microsoft Internet Explorer" && browserVer >=4)) version = "n3";
else version = "x";

if (version == "n3"){    
  usedportage_on = new Image;
  usedportage_on.src = "/img/en/top_menu_03_on.jpg";
  
  usedpembina_on = new Image;
  usedpembina_on.src = "/img/en/top_menu_04_on.jpg";
  
  credit_on = new Image;
  credit_on.src = "/img/en/top_menu_05_on.jpg";
  
  promos_on = new Image;
  promos_on.src = "/img/en/top_menu_06_on.jpg";
  
  contactus_on = new Image;
  contactus_on.src = "/img/en/top_menu_07_on.jpg";
  
  
  

  usedportage_off = new Image;
  usedportage_off.src = "/img/en/top_menu_03_off.jpg";
  
  usedpembina_off = new Image;
  usedpembina_off.src = "/img/en/top_menu_04_off.jpg";
  
  credit_off = new Image;
  credit_off.src = "/img/en/top_menu_05_off.jpg";
  
  promos_off = new Image;
  promos_off.src = "/img/en/top_menu_06_off.jpg";
  
  contactus_off = new Image;
  contactus_off.src = "/img/en/top_menu_07_off.jpg";
}

function img_act(imgName){
  if (version == "n3"){
    imgOn = eval(imgName + "_on.src");
    document [imgName].src = imgOn;
  }
}

function img_inact(imgName){
  if (version == "n3"){
    imgOff = eval(imgName + "_off.src");
    document [imgName].src = imgOff;
  }
}