body {
  background-color:#000077;
}

#centr, #schalt {
  margin:auto;
  text-align:center;
  clear:both;
}

#schalt {
  width:88px;
}

a#bwd, a#fwd {
  width:40px;
  height:40px;
  margin:4px 2px;
  float:left;
}

a#bwd {
  background-image:url(bwd.gif);
}

a#fwd {
  background-image:url(fwd.gif);
}

a#bwd:hover {
  background-image:url(bwd_over.gif);
}

a#fwd:hover {
  background-image:url(fwd_over.gif);
}