if (document.images) {
  image1on = new Image();
  image1on.src = "buttons/bt_02_home_on.gif";

  image2on = new Image();
  image2on.src = "buttons/bt_03_profile_on.gif";

  image3on = new Image();
  image3on.src = "buttons/bt_04_services_on.gif";

  image4on = new Image();
  image4on.src = "buttons/bt_05_projects_on.gif";
  
  image5on = new Image();
  image5on.src = "buttons/bt_06_training_on.gif";
  
  image6on = new Image();
  image6on.src = "buttons/bt_07_contact_on.gif";

  image1off = new Image();
  image1off.src = "buttons/bt_02_home_off.gif";

  image2off = new Image();
  image2off.src = "buttons/bt_03_profile_off.gif";

  image3off = new Image();
  image3off.src = "buttons/bt_04_services_off.gif";

  image4off = new Image();
  image4off.src = "buttons/bt_05_projects_off.gif";
  
  image5off = new Image();
  image5off.src = "buttons/bt_06_training_off.gif";
  
  image6off = new Image();
  image6off.src = "buttons/bt_07_contact_off.gif";

  otherImageDefault = new Image();
  otherImageDefault.src = "buttons/bt_bottom_services.gif";

  otherImage1 = new Image();
  otherImage1.src = "buttons/bt_bottom_home.gif";

  otherImage2 = new Image();
  otherImage2.src = "buttons/bt_bottom_profile.gif";

  otherImage3 = new Image();
  otherImage3.src = "buttons/bt_bottom_services.gif";

  otherImage4 = new Image();
  otherImage4.src = "buttons/bt_bottom_projects.gif";
  
  otherImage5 = new Image();
  otherImage5.src = "buttons/bt_bottom_training.gif";
  
  otherImage6 = new Image();
  otherImage6.src = "buttons/bt_bottom_contact.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");
    }
  }
}