#container{
position: absolute;
top:	50%;
left:	50%;	
margin-top: -306px;  /* == halbe Zeilenhöhe. */
margin-left: -500px; /* == halbe Breite.     */

width: 850px;
height: 577px;
background-image: url(page2.jpg); background-repeat:no-repeat;
border: 0px solid green;
}

#link{
position: absolute;
width:157px; 
height:94px;
top:155px;
left:580px;
border: 0px solid green;


}

#link:hover{
position: absolute;

left:585px;
top:143px;
width: 158px;
height: 96px;
border: 0px solid white;
background-image: url(link3.jpg); background-repeat:no-repeat;
}