Parallel.js: A javascript library for parallel computing

Should add a web worker polyfill like <a href="http://code.google.com/p/fakeworker-js/source/browse/src/javascript/fakeworker.js" rel="nofollow">http://code.google.com/p/fakeworker-js/source/browse/src/jav...</a> to the live demos ...

Is this compatible with non-worker-ready browsers?

Is there anything you can't build with javascript?