hmmm...I always write my client side code by hand(ie. no IDE short cuts), so i'm not sure if there's an easie way of writing the custom validator jscript functions. I'd think maybe for the pre-canned validators, the IDE would come in handy, but for custom ones it'd be hard for the IDE to guess at your custom validation requirements. So in answer to your question, i just modify the html source manually. BUT i believe there is a way to hook up server side custom event handlers if that's what you're limited to, i just don't remember off the top of my head. I'll keep poking around out of curiousity.