If you take a look at this jsFiddle I've set up, it should give you a better idea of what I'm trying to accomplish: http://jsfiddle.net/nicekiwi/p7NaQ/2/
Imagine the contact page on an iPhone's iOS, where as you scroll through the alphabet of contacts, the sections change dynamically. Basically, I have multiple content sections within a single column vertical-scrolling page. My goal is to make each section "stick" to the top of the screen when it reaches a certain point while scrolling down, and seamlessly switch to the next section as you continue scrolling.
I would like to achieve this effect using HTML/CSS with Mootools 1.3 as my JavaScript Library of choice. Any suggestions on how I can implement this? Thanks for your help!