sidebar-divisions.php

	document.on('dom:loaded', function () {
		var spies = $$('a[data-spy]');

		var targets = [];
		for (var i = 0; i < spies.length; i++) {

			var target = $(spies[i].getAttribute('data-spy'));
				target['data-spy'] = spies[i];

			targets.push(target);
		}

		var active_target = null;

		function activate(target) {
			var spy = target['data-spy'];

			spy.up('ul').select('li').invoke('removeClassName', 'active');
			spy.up('li').addClassName('active');
		}

		var global_offset = 50;
		window.onscroll = function () {
			var scroll = document.documentElement.scrollTop || document.body.scrollTop;
				scroll += global_offset;

			for (var i = 0; i < targets.length; i++) {
				var target = targets[i];

				var offset = target.cumulativeOffset().top;
				var offset_next = targets[i + 1] ? targets[i + 1].cumulativeOffset().top : false;

				if (active_target != target && scroll > offset && (!offset_next || scroll < offset_next)) {
					activate(target);
				}
			}
		};
	});