if (document.images) {
  image1on = new Image();
  image1on.src = "images/nav_01r_en.gif";

  image2on = new Image();
  image2on.src = "images/nav_02r_en.gif";

  image3on = new Image();
  image3on.src = "images/nav_03r_en.gif";

  image4on = new Image();
  image4on.src = "images/nav_04r_en.gif";

  image5on = new Image();
  image5on.src = "images/nav_05r_en.gif";

  image6on = new Image();
  image6on.src = "images/nav_06r_en.gif";
  
  image51on = new Image();
  image51on.src = "images/nav_homer.gif";
//------------------------------------------------------
  image11on = new Image();
  image11on.src = "images/nav_01r.gif";

  image22on = new Image();
  image22on.src = "images/nav_02r.gif";

  image33on = new Image();
  image33on.src = "images/nav_03r.gif";

  image4on = new Image();
  image4on.src = "images/nav_04r_en.gif";

  image55on = new Image();
  image55on.src = "images/nav_05r.gif";

  image66on = new Image();
  image66on.src = "images/nav_06r.gif";
  
  image51on = new Image();
  image51on.src = "images/nav_homer.gif";
 //=================================================================================
  image1off = new Image();
  image1off.src = "images/nav_01_en.gif";

  image2off = new Image();
  image2off.src = "images/nav_02_en.gif";

  image3off = new Image();
  image3off.src = "images/nav_03_en.gif";

  image4off = new Image();
  image4off.src = "images/nav_04_en.gif";

  image5off = new Image();
  image5off.src = "images/nav_05_en.gif";

  image6off = new Image();
  image6off.src = "images/nav_06_en.gif";
  
  image51off = new Image();
  image51off.src = "images/nav_home.gif";  
  //---------------------------------------------------
  image11off = new Image();
  image11off.src = "images/nav_01.gif";

  image22off = new Image();
  image22off.src = "images/nav_02.gif";

  image33off = new Image();
  image33off.src = "images/nav_03.gif";

  image4off = new Image();
  image4off.src = "images/nav_04_en.gif";

  image55off = new Image();
  image55off.src = "images/nav_05.gif";

  image66off = new Image();
  image66off.src = "images/nav_06.gif";
  
  image51off = new Image();
  image51off.src = "images/nav_home.gif";  

}

function changeImages() {
  if (document.images) {
    for (var i=0; i<changeImages.arguments.length; i+=2) {
      document[changeImages.arguments[i]].src = eval(changeImages.arguments[i+1] + ".src");
    }
  }
}