html, body {
 margin: 0;
 padding: 0;
 height: 100%;
 min-height: 100%;
}
#headerInner {
 margin: 0 auto;
 position: relative;
 height: 99px;
 min-height: 99px;
 width:990px;
 min-width: 990px;
 background-image: url('../images/back_head_innerL.jpg');
 background-repeat: no-repeat;
 background-position: center top;
}
#hauptmenue {
 background-image: url('../images/back_mnu_umgebung.jpg');
}
#contentLeft {
 width: 320px;
 background-color: #fff;
 float: left;
}
#contentRight {
 width: 555px;
 background-color: #fff;
 float: right;
}