dt { margin-left: 1.5em; font-weight: bold; }
dd { margin-left: 1.5em; margin-bottom: 1em; }
dt.url { float: left; margin-right: 1em; }

a#headerimg { width: 120px; height:70px; background: url(images/header.gif) no-repeat; }
a:hover#headerimg { background: url(images/header2.gif) no-repeat; }