// Many thanks to Dave Shea for his CSS Sprites 2!
// http://www.alistapart.com/articles/sprites2

$(document).ready(function(){
	$(".nav").children("li").each(function() {
		var current = "nav current-" + ($(this).attr("class"));
		var parentClass = $(".nav").attr("class");
		if (parentClass != current) {
			$(this).children("a").css({backgroundImage:"none"});
		}
	});
	function attachNavEvents(parent, myClass) {
		$(parent + " ." + myClass).mouseover(function() {
			$(this).before('<div class="nav-' + myClass +'"></div>');
			$("div.nav-" + myClass).css({display:"none"}).fadeIn(200);
		}).mouseout(function() {
			// fade out & destroy pseudo-link
			$("div.nav-" + myClass).fadeOut(200, function() {
				$(this).remove();
			});
		}).mousedown(function() {
			$("div.nav-" + myClass).attr("class", "nav-" + myClass + "-click");
		}).mouseup(function() {
			$("div.nav-" + myClass + "-click").attr("class", "nav-" + myClass);
		});
	}
	attachNavEvents(".nav", "gov");
	attachNavEvents(".nav", "map");
	attachNavEvents(".nav", "hist");
	attachNavEvents(".nav", "cont");
});