#roadmap {	display:block;	position:relative;	width:612px;	height:687px;	background:url('images/roadmap_background.jpg');}.particles {	display:block;	position:absolute;	width:150px;	height:90px;	background:url('images/roadmap_fundamental.gif');	top:493px;	left:308px;}.hadrons {	display:block;	position:absolute;	width:121px;	height:90px;	background:url('images/roadmap_hadrons.gif');	top:392px;	left:136px;}.atom {	display:block;	position:absolute;	width:103px;	height:71px;	background:url('images/roadmap_atom.gif');	top:201px;	left:387px;}.matter {	display:block;	position:absolute;	width:97px;	height:81px;	background:url('images/roadmap_matter.gif');	top:64px;	left:315px;}.periodic {	display:block;	position:absolute;	width:161px;	height:128px;	background:url('images/roadmap_periodic.gif');	top:64px;	left:93px;}