Also das wäre der Code zum Header:
#header {
background-image: url(images/header.png);
background-repeat:no-repeat;
width:100%;
min-width:980px;
height:189px;
background-position: center;
}
#header_links {
background-color:#0F0;
width:100%;
height:189px;
float:left;
}
#header_rechts {
background-color:#FFF;
width:100%;
height:189px;
float:right;
}