html { text-align: center}

body  { position: absolute;
left: 50%;
width: 900px;
margin-left: -450px; /* negative H�lfte von width: 500px */
top: 50%;
height: 400px;
margin-top: -200px; /* negative H�lfte von height: 300px */}


img {display: none;}

.imag img{display:none;}

.imag{
  background-image: url(images/Ing-start.gif);
  width: 900px;
  height: 400px;
  display: block;
}
.imag:hover{
  background-image: url(images/Ing-start-hover.gif);
}