<!--

if (document.images) {
  image1on = new Image(); image1on.src = "img/nav_on_addiction.gif";
  image2on = new Image(); image2on.src = "img/nav_on_withdrawl.gif";
  image3on = new Image(); image3on.src = "img/nav_on_statistics.gif";
  image4on = new Image(); image4on.src = "img/nav_on_information.gif";
  image5on = new Image(); image5on.src = "img/nav_on_history.gif";
  image6on = new Image(); image6on.src = "img/nav_on_sideeffects.gif";
  image7on = new Image(); image7on.src = "img/nav_on_treatment.gif";
  image8on = new Image(); image8on.src = "img/nav_on_pictures.gif";
  image9on = new Image(); image9on.src = "img/nav_on_effects.gif";
  
  image1off = new Image(); image1off.src = "img/nav_off_addiction.gif";
  image2off = new Image(); image2off.src = "img/nav_off_withdrawl.gif";
  image3off = new Image(); image3off.src = "img/nav_off_statistics.gif";
  image4off = new Image(); image4off.src = "img/nav_off_information.gif";
  image5off = new Image(); image5off.src = "img/nav_off_history.gif";
  image6off = new Image(); image6off.src = "img/nav_off_sideeffects.gif";
  image7off = new Image(); image7off.src = "img/nav_off_treatment.gif";
  image8off = new Image(); image8off.src = "img/nav_off_pictures.gif";
  image9off = new Image(); image9off.src = "img/nav_off_effects.gif";
}

function changeImages() {
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    for (var i=0; i<changeImages.arguments.length; i+=2) {
      document[changeImages.arguments[i]].src = eval(changeImages.arguments[i+1] + ".src");
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  }
}

// -->