#header {
position: absolute;
left:50%;
width:760px;
top:60px;
margin-left:-380px;
height:252px;
background-image:url(../images/image_content.jpg);
z-index: 2;
}
#content {
position: absolute;
left:50%;
width:750px;
top:330px;
margin-left:-375px;
z-index: 1;
}