// Navigation

if (document.images) {

  image1on = new Image();

  image1on.src = "../images/nav_on_01.gif";


  image2on = new Image();

  image2on.src = "../images/nav_on_02.gif";


  image3on = new Image();

  image3on.src = "../images/nav_on_03.gif";


  image4on = new Image();

  image4on.src = "../images/nav_on_04.gif";
  

  image5on = new Image();

  image5on.src = "../images/nav_top_on_01.gif";
  

  image6on = new Image();

  image6on.src = "../images/nav_top_on_02.gif";
  
  
  image1off = new Image();

  image1off.src = "../images/nav_off_01.gif";


  image2off = new Image();

  image2off.src = "../images/nav_off_02.gif";


  image3off = new Image();

  image3off.src = "../images/nav_off_03.gif";


  image4off = new Image();

  image4off.src = "../images/nav_off_04.gif";
  

  image5off = new Image();

  image5off.src = "../images/nav_top_off_01.gif";
    

  image6off = new Image();

  image6off.src = "../images/nav_top_off_02.gif";

 
}
function turnOn(imageName) {

  if (document.images) {

    document[imageName].src = eval(imageName + "on.src");
  }
}
function turnOff(imageName) {

  if (document.images) {

    document[imageName].src = eval(imageName + "off.src");
  }
}