active_menu - Вопросы по CSS

ul#mainlevel-nav {
	text-decoration: none;
	list-style: none;
	padding: 0;
	margin: 0 0px;
	float:left;
	color:#E7A038;
	}
ul#mainlevel-nav li {
	width:172px;
	float:left;
	font-size:0.9em;
	height:37px;
	line-height:37px;
	padding: 0 3px;
	display:inline;
	}
ul#mainlevel-nav li a:link, ul#mainlevel-nav li a:visited {
	font-size: 16px;
	text-align:center;
	text-decoration:none;
	white-space:nowrap;
	display:block;
	overflow:hidden;
	color: #000000;
	margin:0;
	padding:0;
	background: url(/templates/genstrouy3/images/knopka.gif);
	}
ul#mainlevel-nav li a:hover {
	white-space:nowrap;
	margin:0;
	padding:0;
	color: #504D65;
	background-position: -172px 0;
	}