/* CSS layout */
body {
	margin: 0;
	padding: 0;
	background-image: url('../Bilder/Layout/hintergrund_mauer_dunkel.jpg');
}

#main {
    width:                   900px;
    margin-top:              5px;
    margin-bottom:           0px;
    margin-left:             auto;
    margin-right:            auto;
}

#masthead {
	height: 130px;
	width: 900px;
	background-image: url('../Bilder/Layout/banner_5_jahre.jpg');
}

#top_nav {
	height: 23px;
	width: 900px;
	background-color: #990000;
}

#container {
	width: 900px;
	background-image: url('../Bilder/Layout/hintergrund_mauer_hell.gif');
	border-width: 0px;
	float: right;
}

#left_col {
	width: 190px;
	float: left;
	background-color: gray;
	border-width:0px;
	
}
<style type="text/css" media="screen">
<!-- 
body {
margin: 0;
padding: 0;
background-color: gray;
font-family: Arial, Helvetica, Sans-Serif;
}
dl, dt, dd, ul, li {
margin: 0;
padding: 0;
list-style-type: none;
}
#menu {
position: static; /* Menu position that can be changed at will */
top: 0;
left: 0;
}
#menu {
width: 12em;
}
#menu dt {
cursor: pointer;
margin: 2px 0;
height: 23px;
line-height: 20px;
text-align: center;
font-weight: bold;
border: 1px solid #CCCCCC;
background: black;
}
#menu dd {
	border: 1px solid #CCCCCC;
}
#menu li {
text-align: center;
background: black;
}
#menu li a, #menu dt a {
color: yellow;
text-decoration: none;
display: block;
border: 0 none;
height: 80%;
}
#menu li a:hover, #menu dt a:hover {
background-color: yellow;
color: black;
}
-->
</style>

#page_content {
	margin-left: 200px;
	background-image: url('../Bilder/Layout/hintergrund_mauer_hell.gif');
	border-width: 0px;
	float: right;
}

#footer {
	clear: both;
	width: 900px;
	height: 19px;
	background-color: #990000;
}