Gradients in the theme

[Bluelens]

I have a new install of CPG and have a modified "Anabolica" for the theme.  I noticed that when viewing the gallery in IE you can see a gradient   in the headerbars.  When you look at the gallery in Firefox and Safari the gradients are gone and the bar is a solid color.  Is this a feature only accesible through the IE browser or am I missing something to make it work under FF, Safari, and other browers?

The site can be found here -> http://www.flamingherongallery.com

Thanks.

[kegobeer]

filter: Alpha is an Internet Explorer only attribute.  Doesn't work in any other browser.