home_on = new Image();
home_on.src = "../common/menu_home_on.jpg";
home_on.src0 = "common/menu_home_on.jpg";

photography_on = new Image();
photography_on.src = "../common/menu_photography_on.jpg"
photography_on.src0 = "common/menu_photography_on.jpg";

about_on = new Image();
about_on.src = "../common/menu_about_on.jpg";
about_on.src0 = "common/menu_about_on.jpg";
 
home_off = new Image();
home_off.src = "../common/menu_home_off.jpg";
home_off.src0 = "common/menu_home_off.jpg";

photography_off = new Image();
photography_off.src = "../common/menu_photography_off.jpg";
photography_off.src0 = "common/menu_photography_off.jpg";

about_off = new Image();
about_off.src = "../common/menu_about_off.jpg";
about_off.src0 = "common/menu_about_off.jpg";

function turn_on (image_name, mode) {
  if (mode == 1) {
    document[image_name].src = eval(image_name + "_on.src");
  }
  else {
    document[image_name].src = eval(image_name + "_on.src0");
  }
}

function turn_off (image_name, mode) {
  if (mode == 1) {
    document[image_name].src = eval(image_name + "_off.src");
  }
  else {
    document[image_name].src = eval(image_name + "_off.src0");
  }
}