Updating a sidebar I stole from http://matthewcarleton.com/articles

stolen-sidebar.js

jQuery(document).ready(function($){
	
	// Optimalisation: Store the references outside the event handler:
	var $window = $(window);
	var offset = $("#sidebar").offset();
	var topPadding = 30;
	
	function checkWidth() {
		var windowsize = $window.width();
		if (windowsize > 960) {
			$window.scroll(function() {
				if ($window.scrollTop() > offset.top) {
					$("#sidebar").stop().animate({
						marginTop: $window.scrollTop() - offset.top + topPadding
					});
				} else {
					$("#sidebar").stop().animate({
						marginTop: 0
					});
				}
			});
		}
	}
	// Execute on load
	checkWidth();
	// Bind event listener
	$(window).resize(checkWidth);

});

style.css

@media only screen and (max-width: 960px) {
	#sidebar {
		margin-top:30px !important;
	}
}