Maybe try removing the quotes around .9 - it is probably looking for a number rather than a string. I could see this borking IE.
-- Josh -----Original Message----- From: jquery-en@googlegroups.com [mailto:jquery...@googlegroups.com] On Behalf Of Eric Sent: Thursday, December 11, 2008 11:47 AM To: jQuery (English) Subject: [jQuery] IE Opacity Issue Having a problem setting the overlay opacity in IE. The default works fine, but as soon as I try to change it, all I get is the overlay color at 100% opacity. Here's my call: $.blockUI({ message: $(".dialogPopup"), css: { border: 'none', textAlign: 'left' }, overlayCSS: { backgroundColor: '##fff', opacity: '.9' } }); This works fine in FF2 & 3. Any ideas? Thanks, Eric