JSAmp is an unobtrusive Javascript implementation of sexy ampersands. People usually do this on the server-side, but this variant is client-side only. Anyone can use it. You should probably read my blog post for the details and the code.
You can also check Dan Cederholm's simplebits.com website for a taste of what you can achieve with sexy ampersands.
What you see below is a form that configures and runs a test instance of JSAmp easily. You can play with the settings a bit if you want. Hit "Amplify" and watch the ampersands get replaced. Defaults for the tests are prefilled.