function preloadImage(imageurl) {
  image = new Image();
  image.src = imageurl;
}

window.onload = function() {
  preloadImage('./images/background/borderbottomleft.png');
  preloadImage('./images/background/borderbottomright.png');
  preloadImage('./images/background/bordertopleft.png');
  preloadImage('./images/background/bordertopright.png');
  preloadImage('./images/background/borderbottomleft2.png');
  preloadImage('./images/background/borderbottomright2.png');
  preloadImage('./images/background/bordertopleft2.png');
  preloadImage('./images/background/bordertopright2.png');

  preloadImage('./images/background/winbottomleft.png');
  preloadImage('./images/background/winbottomright.png');
  preloadImage('./images/background/wintopleft.png');
  preloadImage('./images/background/wintopright.png');
  preloadImage('./images/background/wintopright2.png');
  preloadImage('./images/background/winleft.png');
  preloadImage('./images/background/winright.png');
  preloadImage('./images/background/wintop.png');
  preloadImage('./images/background/winbottom.png');

  preloadImage('./images/buttons/button40left.png');
  preloadImage('./images/buttons/button40right.png');
  preloadImage('./images/buttons/button40back.png');
  
  preloadImage('./images/buttons/sbuttonleft.png');
  preloadImage('./images/buttons/sbuttonright.png');
  preloadImage('./images/buttons/sbuttonback.png');

  preloadImage('./images/buttons/buttonleft.png');
  preloadImage('./images/buttons/buttonright.png');
  preloadImage('./images/buttons/buttonback.png');
  preloadImage('./images/buttons/buttonlefttop.png');
  preloadImage('./images/buttons/buttonrighttop.png');

  preloadImage('./images/buttons/finderbutton.png');
  preloadImage('./images/buttons/link.png');
  preloadImage('./images/buttons/dropdown.png');
};