* {
		margin:0;
		padding:0;
		}

	html, body {
		height:100%;
		}

	body {
		background-color:#dedede;
		text-align:center;
		}


		
	#abstand { 
		width:1px;
		height:50%;
		margin-bottom:-300px; /* halbe Höhe von #container */
		float:left;
		}

	#main {
		margin:0 auto;
		text-align:left;
		height:600px;
		width:800px;
		clear:left;
		background : url(images/_elemente/bg.gif) no-repeat top left #fff;
		}

	#oben{
		height:300px;
		width:800px;
		background : #fff;
		}

	#mitte{
		height:288px;
		width:800px;
		background : #8f8f8f;
		}

	#unten{
		height:12px;
		width:800px;
		background : #8f8f8f;
		}