#366250 by sirkitree: Fix deprecated jquery selectors so we can work with jquery 1.2.6 as well as 1.3.2.

#270892 by aclight (expanded by me): put default action and validator options in a fieldset to make the form less confusing.

NEW: argument defaults and validation; pluggable. This will greatly ease some of the problems with argument discovery. We need to get a few more basic plugins written for this.