WordPress › Riloadr for WordPress

Riloadr for WordPress is a cross-browser responsive images loader for WordPress 3.0.0 and up.

Upload the riloadr-for-wordpress folder to your plugins directory (ie. /wp-content/plugins/)
Activate the plugin through the 'Plugins' menu in WordPress
Set options from the Settings->Riloadr menu
Make sure your stylesheet is set up with the following CSS:

img {max-width: 100%;}

.lt-ie8 img{-ms-interpolation-mode: bicubic;}

.lt-ie7 img{width: 100%;}