div#container {width:920px; margin:0 auto; position:relative;}

div#container{width:920px;}
div#content{float:right;width:720px}
div#navigation{float:left;width:180px}
div#extra{float:left;clear:left;width:180px}
div#footer{clear:both;width:100%}

#setwidth_button {display:none;}
#fluidwidth_button {display:inline;}