My question is regarding the jQuery Support system.
I\'d like to know if it is possible to tell whether or not the browser will support semi-transparent background P
I think I understand what you're after TM, since I'm trying to do something similar: If alpha PNG is supported, insert a PNG using jQuery. Otherwise, do nothing.
The only solution I can think of is inserting a DIV using jQuery. Then, in the CSS you set the DIV's background-iamge to the PNG you want to use followed by a conditional comment to feed IE6 a transparent gif instead.
I haven't tried it out yet but it should do the trick.