ul#mainnav li.corpnav a { background: url(../images/navTabLeft.gif) no-repeat 0 0; }
ul#mainnav li.corpnav a { font-weight: bold; }
ul#mainnav li.corpnav a span { background: url(../images/navTabRight.gif) no-repeat top right; }
ul#mainnav li.corpnav ul li a,
ul#mainnav li.corpnav ul li a:hover { background: none; font-weight: normal; }
ul#mainnav li.corpnav ul {
	display: block;
}