div#header h1{}
div#container{}
div#content p{}
div#navigation{}
div#extra{}
div#footer{}

div#container{width:760px;margin:0 auto}
div#content{float:left;width:760px}
div#navigation{float:left;width:200px}
div#extra{float:left;clear:left;width:200px}
div#footer{clear:both;width:100%}