[rules-users] rules on web application

Hi all, I *think* we should use a rules engine on our web application, as some bussiness rules should be changed by user, and their context can be quite reduced. We have a web application, and rules would apply to some bussiness objects, but my question is about hot to integrate the rules editor in our web application. One option I can imagine is to let him modify XML inside a textarea, but it seems quite hard for him. Is there any web editor for rules that we can integrate in our web application, as in eclipse? Thanks Jose Ramón