jQuery.spritely is a jQuery plugin created by Artlogic for creating dynamic character and background animation in pure HTML and JavaScript. It's a simple, light-weight plugin with a few simple methods for creating animated sprites such as the birds you see on this page, and dynamic scrolling backgrounds.
Spritely has the following great advantages
• it works well on iPhone/iPod Touch/iPad - check out this page on an iPhone.
• It has been tested successfully on all the major browsers - even Internet Explorer 6
• it's a great alternative to Flash if your desired platform does not support it.
• it's light-weight so you can do fill the whole window with movement without draining bandwidth.
• animated objects can also fly above the text of a web page, or you could animate a background, without affecting other elements on the page.
• you should be able to make fully accessible web pages in pure html and javascript without any problem