So far we change element's background based on VFP properties .DisabledColor and .DisabledImage
What we can do is create a .class.disabled and/or #id.disabled CSS rule, with an {opacity:...} directive - and usual IE LT 8 hacks - when .DisabledImage is not specified.
A good way to do that is just to use an opacity of about .75 on buttons. I use a .disabled CSS style for that.
+++ Rick ---
-- thn (FoxInCloud)