jQuery waypoints

gistfile1.txt

    	Setup waypoints for each block
		$('.js-block').each(function(){
			addWaypoint( $(this), 'down' );
			addWaypoint( $(this), 'up' );
		});

		function addWaypoint( $elem, direction ){
			var thisID = that.formatID( $elem.attr('id') ),
				nextID = $elem.next('.js-block').attr('id') || null;

				$elem.waypoint( function(  ){
					waypointHandler( $elem );
				},{
					offset : function(){
						if( direction === 'up' ){
							return getOffset( thisID, nextID, 'up' );
						}
						return -CONFIG.pageWaypoints[ thisID ];
					}
				});
		}