As it happens I recognised the effect without needing to see the code, but had that not been the case, the JS file begins: /** @license * DHTML Snowstorm!

As it happens I recognised the effect without needing to see the code, but had that not been the case, the JS file begins: /** @license * DHTML Snowstorm! JavaScript-based Snow for web pages * -------------------------------------------------------- * Version 1.41.20101113 (Previous rev: 1.4.20091115) * Copyright (c) 2007, Scott Schiller. All rights reserved. * Code provided under the BSD License: * http://schillmania.com/projects/snowstorm/license.txt */