Respond.js

A fast & lightweight polyfill for min/max-width CSS3 Media Queries (for IE 6-8, and more)

• Copyright 2011: Scott Jehl, scottjehl.com
• Dual licensed under the MIT or GPL Version 2 licenses.

The goal of this script is to provide a fast and lightweight (3kb minified / 1kb gzipped) script to enable responsive web designs in browsers that don't support CSS3 Media Queries - in particular, Internet Explorer 8 and under. It's written in such a way that it will probably patch support for other non-supporting browsers as well (more information on that soon).
If you're unfamiliar with the concepts surrounding Responsive Web Design, you can read up here and also here
Demo page (the colors change to show media queries working)

https://github.com/scottjehl/Respond