[jQuery] IE Opacity Issue

[Eric]

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