Stuck-On-Top is a project mainly written in JavaScript, it's free.
Makes headers stick to the top of the screen while staying within their container
Demo
Stuck on top is a simple jQuery plugin that sticks a specified element to the top of the screen while keeping it within it's container.
Usage
$("#container").stickyHeaders();OR
$("#container").stickyHeaders(options);Options headerClass: The css class of the header to stick to the top of the page. Defaults to header.
padding: The amount of padding to apply to the top of the screen before the header gets stuck. Useful if you have a fixed menu bar at the top of your page. Defaults to 0px.