cssFx is a standalone polyfill that inserts the vendor-specific CSS3 properties necessary for old and new browsers. This saves you tons of time, maintenance, and bandwidth! Check it out:
Box shadows, border radius, multiple columns, border image, RGBA, transforms, keyframes, transitions (and properties inside transitions), flexible box, gradients, and a ton of other useful things (like opacity, ellipsis, and inline-block).
Firefox 3+, Chrome 1+, Internet Explorer 6+, Safari 3+, Opera 9+.
Include the JS file, and give external stylesheets the "cssfx" class:
<link rel="stylesheet" href="effects.css" class="cssfx">
<script src="cssfx.min.js"></script>