Highlight the text menu if on current page

I like to know if CSS can be used to highlight the CSS nav menu if the current page is the page that the menu links to. For example, the folowing code is my side bar navigation menu.

#lftSideMenu {
	float: left;
	width: 165px;
	margin: 0 0px 0 0;
	background-color: #FFFFFF;
	font-family: Verdana, Arial, Helvetica, sans-serif;
	font-size: 12px;
	font-style: normal;
	font-weight: normal;
	padding-bottom: 5px;
	padding-left: 5px;
	}
#lftSideMenu ul {
	font-family: Verdana, Arial, Helvetica, sans-serif;
	font-size: 11px;
	list-style-type: none;
	margin-left: 0px;
	padding-left: 0px;
	color: #000066;
	font-weight: bold;
	}
#lftSideMenu li {
	margin: 0px;
	padding: 0px;
	}
#lftSideMenu A:link{
	padding: 0px 0px 0px 5px;
	text-decoration: none;
	display: block;
	width: 100%;
	margin: 0px;
	border-bottom-width: 1px;
	border-bottom-style: solid;
	border-bottom-color: #000000;
	}
#lftSideMenu A:visited{
	padding: 0px 0px 0px 5px;
	text-decoration: none;
	display: block;
	width: 100%;
	margin: 0px;
	border-bottom-width: 1px;
	border-bottom-style: solid;
	border-bottom-color: #000000;
	color: #0000CC;
	}
#lftSideMenu A:hover{
	font-weight: bold;
	background-color: #FFCC99;
	color: #000033;
	text-decoration: none;
	margin: 0px;
	padding: 0px 0px 0px 5px;
	border-bottom-width: 1px;
	border-bottom-style: solid;
	border-bottom-color: #000000;
	}
#lftSideMenu A:active {
	background-color: #FF6600;
	}

How do add to this or modify this code so that the nav menu will be hightlighed if the use is on that current page?

Your help is appreciated.

ljCharlie