I was working on a UI screen the other day with some Javascript in it, and because the js was rather simple (show and hide areas of the screen), I decided to just code it myself. That way I could try it out, feel the experience and adjust things as I went. Went pretty well. I had to learn the JQuery show and hide command, but that’s supersimple. So yea, if you work on UI’s, try JQuery to mock up simple stuff. It might help.