Move navhighlight closure to setup.js

Also limits the anchors manipulated to site-navigation

scripts/setup.js

@@ -24,3 +24,33 @@
         }).fail(fail);
     }
 })(jQuery);
+
+(function ($) {
+	//Add current view's highlighting to the navigation 
+	$(window).scroll(function() {
+		//console.log("They see me scrollin, they hatin");
+
+		//clear highlighting
+		$('.site-navigation a').removeClass("active");
+
+		//calc current viewport
+		var viewTop = $(window).scrollTop();
+		var viewBottom = viewTop + $(window).height();
+
+		//for all h1 and h2 elements, check if they are visible
+		//performance tweak: stop each() after the first element is found to be behind view
+		$('h1, h2').each(function(i,e) {
+				//get element position;
+				var eTop = $(e).offset().top;
+				var eBottom = eTop + $(e).height();
+				if (eTop >= viewTop) {
+					if (eBottom <= viewBottom) {
+						$('.site-navigation a[href="/#'+e.id+'"]').addClass("active");
+					} else {
+						//console.log("Start skipping test with "+e.id);
+						return false;
+					}
+				}
+		});
+	});
+})(jQuery);