html,body{
  height:100%;
  margin:0;
  padding:0;
}

img{
  border:0;
}

#spacer,#center{
  position:absolute;
  padding:0;
}

#spacer{
  width:100%;
  height:100%;
  min-width:600px;
  min-height:200px;
  margin:0;
}

#center{
  width:600px;
  min-height:200px;
  position:absolute;
  top:50%;
  left:50%;
  margin:-110px 0 0 -300px;
}