body
{

background-image:url('images/bg.jpg');
background-repeat:no-repeat;
background-attachment:fixed;
background-position:center; 
background-color:#000000;
margin-top:10px;
color:#000
}
.header
{
width: 800px;
left: 50%;
margin-left: -400px; /* - (width/2) */
position: relative;

}
.menu
{
width: 770px;
left: 50%;
margin-left: -385px; /* - (width/2) */
position: relative;
z-index: 1;
}
.body
{
width: 850px;
left: 50%;
margin-left: -425px; /* - (width/2) */
position: relative;

}