if (document.images){
  var game_out = new Image();
  game_out.src = "/images/header/game.jpg";
  var game_over = new Image();
  game_over.src = "/images/header/game_over.jpg";
  
  var story_out = new Image();
  story_out.src = "/images/header/story.jpg";
  var story_over = new Image();
  story_over.src = "/images/header/story_over.jpg";
  
  var study_out = new Image();
  study_out.src = "/images/header/study.jpg";
  var study_over = new Image();
  study_over.src = "/images/header/study_over.jpg";
  
  var show_out = new Image();
  show_out.src = "/images/header/show.jpg";
  var show_over = new Image();
  show_over.src = "/images/header/show_over.jpg";
  
  var camp_out = new Image();
  camp_out.src = "/images/header/camp.jpg";
  var camp_over = new Image();
  camp_over.src = "/images/header/camp_over.jpg";
}

function igt_mouse_over(img){
  if(document.images){
    document.images[img].src = eval(img + "_over.src");
  }
}
function igt_mouse_out(img){
  if(document.images){
    document.images[img].src = eval(img + "_out.src");
  }
}