Sunrise is an internet utility for your PDA, it utilizes a Mozilla extension that'll allow you to quickly send a page to Sunrise for later offloading to your PDA. There is also some scripting support, from URI rewriting to dynamic document properties. Sunrise also uses Rhino as a scripting engine inside the SDL's you create. While you won't have full JavaScript functionality, it does provide some core objects. There is a handy walkthrough at MobileRead's forums, see the old FAQ here. Sunrise was written by the same person who wrote JPluck, which makes sense, as Sunrise is a Java app and essentially JPluck 2. And supposedly Sunrise is intended to become a commercial app.