Sounds like a bit of a silly question but it'd be a nice feature.
Does the jQuery UI Icon system have an "empty" icon - one with no image?
Am I forced to do some custom styling on a ui-icon-empty and move the background to an area of the sprite that is off the chart?
if you look in the css file provided by jquery ui theme you will find a class named :
ui-icon-blank
you can use the same to have blank icons.
Thanks ...
TC