#home_button {
  display: block;
  float: left;
  width: 48px;
  height: 42px;
  background: top left url(/style/buttons/home.splitted.gif);
}

#home_button:hover {
  background: top right url(/style/buttons/home.splitted.gif);
}

#home_button_dark {
  display: block;
  float: left;
  width: 48px;
  height: 42px;
  background: top left url(/style/buttons/home.splitted.dark.gif);
}

#home_button_dark:hover {
  background: top right url(/style/buttons/home.splitted.dark.gif);
}