$(document).ready(function () {

    // Extra span for accessible navigation. Span is a holder for a background image
    jQuery("ul.nav li.headlink > a").prepend("<span></span>");

    // Highlight nav menu on hover, except for already highlighted.
    jQuery("ul.nav li.headlink:not(ul.nav li.menuon)").hover(
		function () {
		    jQuery(this).addClass("menuon");
		},
		 function () {
		     jQuery(this).removeClass("menuon");
		 }
		);

});