#container{width:1000px;margin:0 auto}
 #wrapper{float:left;width:100%}
 #content{width:700px;margin: 0 150px;}
 #navigation{float:left;width:150px;margin-left:-1000px}
 #extra{float:left;width:150px;margin-left:-150px}
 #footer{clear:left;width:100%}