div.div-principal {
	position:absolute;
	width: 850px;
	left: 50%;
	margin-left:-425px;
	margin-top:40px;
	background-image:url(../photos/vallon_fond.jpg);
}
		
div.div-header {
	position:relative;
	text-align:center;
	width:100%;
	height:95px;			
}

div.div-content {
	position:relative;
	width:80%;
	padding-left:160px;
	height:800px;
}
		
div.div-menu {
	
	
	padding-top:20px;
	float:left;
}	
		
div.div-body {
	position:absolute;
	padding-top:20px;
	width:63%;
	float:left;
}
		
div.div-footer {
	position:static;
	padding-top:20px;
	height:500px;
	width:22%;
    float:right;
}