TransM.js

From the website :

Transm.js 1.0 allows you to add programmable image transitions to your webpages. It uses unobtrusive javascript to keep your code clean.

Transm.js can run on major browsers such as Mozilla Firefox 1.5+, Opera 9+, Safari 2+, Chrome 3+ and IE 6+. This script supports 113 image transition for browsers supporting HTML 5 canvas, and 51 image transition for browsers supporting VML filter. Those supported transitions including alpha transition, checkerboard, blinds, circles, gradient, pull, etc.

This script is distributed under Netzgestade Non-commercial Software License Agreement, so you can use this script for non-commercial purpose and private website only based on special conditions.