Sorry, hab erst jetzt realisiert, dass es schon ein Element mit der id header gibt.
HTML-Code: 
<style type="text/css">

.contactTable {
width:300px !important; height:150px !important; padding:0px !important;
background-image:url("http://npshare.de/files/9d18e005/contact.jpg");
background-attachment:scroll; background-position:center center;
background-repeat:no-repeat; background-color:transparent;}
.contactTable table, table.contactTable td { padding:0px !important;
border:0px; background-color:transparent; background-image:none;}
.contactTable a img {visibility:hidden; border:0px !important;}
.contactTable a {display:block; height:28px; width:115px;}
.contactTable .text {font-size:1px !important;}
.contactTable .text, .contactTable a, .contactTable img {filter:none !important;}

body          {
        background-color:rgb(0,0,0);
        background-repeat:v-repeat; 
        background-position:center center;
        background-attachment:fixed;
        background-image:url(http://npshare.de/files/062dab5d/Hintergrund.jpg)     
        }

table, tr, td {
	background-color: transparent;
        border-width: 0;
	}
table table {
	border-width:0px;
	}
table table table {
	border-width: 2px;
	border-color: rgb(0, 0, 0);
	background-color: rgb(0,0,0);
        border-style:solid;
	}

table table table table{
	border-width:0px;       
        }

table table table td {
	background-color: rgb(0,0,0);
	filter:alpha(opacity=100);
	-moz-opacity:1;
	opacity:1;
	-khtml-opacity:1;
	}

table table table table td {
        filter:none;
	}

body, ul, div, span, td, p, .orangetext15, .whitetext12, .lightbluetext8, strong, b, u, .redtext, .redbtext, .btext, .text, .nametext, .blacktext10, .blacktext12 {
	font-family: Times New Roman;
	font-size: 14px;
	color: rgb(255, 255, 255);
	font-weight: normal;
	font-style: normal;
	text-decoration: none;
	}
.nametext {
	padding: 5px;
	font-family: Impact;
	font-size: 30px;
	color: rgb(159, 77, 179);
	font-weight: bold;
	font-style:normal ;
	text-decoration: none;
	display: block;
	}
.whitetext12, .orangetext15 {
	font-family: Impact;
	font-size: 15px;
	color: rgb(159, 77, 179);
	font-weight: normal;
	font-style: normal;
	text-decoration: none;
	}
a.navbar:link, a.navbar:active, a.navbar:visited, a.navbar:hover, a.man:link, a.man:active, a.man:visited, a.man:hover, a, a:link, a:active, a:visited, a:hover, a.navbar:link, a.navbar:active, a.navbar:visited, a.navbar:hover, a.text:link, a.text:active, a.text:visited, a.text:hover, a.searchlinksmall:link, a.searchlinksmall:active, a.searchlinksmall:visited, a.searchlinksmall:hover, a.redlink:link, a.redlink:active, a.redlink:visited, a.redlink:hover {
	color: rgb(255, 255, 255);
	font-weight: bold;
	font-style: normal;
	text-decoration: underline;
	}
a.navbar:hover, a.man:hover, a:hover {
	color: rgb(159, 77, 179);
	font-weight: bold;
	font-style: normal;
	text-decoration: underline;
	}
.badge {
	position: absolute;
	left: 1px;
	top: 1px;
	}

body table {
margin-top:13%;
}

body td table, body div table {
margin-top: 0;
}

.header {
        display: block;
        width: 818px;
        margin: 0 auto; /* Zentrierung */
        height: 500px;
        position : absolute;
        top: 10px;
}


</style>


<img src="http://npshare.de/files/02a86509/Top.jpg" class="header" />