body
{ 
background-image: url('bk.jpg');
background-repeat: no-repeat;
background-position: center;
margin:0 0 0 0;
background-color:#000000;
}

#center { position: absolute; top: 50%; width: 100%; height: 1px; overflow: visible }
#main { position: absolute; left: 50%; width: 933px; margin-left: -466px; height: 541px; top: -270px }