Changing the color of the navbar in ie9 (it works in chrome and firefox)

[J]

Hi there,

I'm currently using bootstrap 2.0 and had thought I'd cracked how to change 
the background colour of the navbar using my own custom css file (placed 
after the bootstrap css files)

.navbar-inner, .navbar .fill {
  background: white;
  background-color:  white;
  background-image: url('/static/assets/white_background.png');
  background-repeat: repeat-x;
  position: relative;
}

This works in chrome and firefox, but ie9 gives me a black navbar for no 
apparent reason. Am I missing something? Ideally I'd like the background 
image to be displayed, with the other background colors there simply as a 
fallback.

Cheers,
J