function loadGraphic(obj, newFileName)
{
  var img = new Image();
	img.src = newFileName;

  obj.src = img.src;
}

function preloadImages()
{
  var img = new Image();
  img.src = "img/download_hover.png";
  img.src = "img/tutorials_hover.png";
  img.src = "img/guestbook_hover.png";
  img.src = "img/home_hover.png";
  img.src = "img/impressum_hover.png";
  img.src = "img/infos_hover.png";
  img.src = "img/misc_hover.png";
}