Background image not showing in Firefox.

Hi
I have a problem getting a background image to show in Firefox,
it's ok in internet explorer 6.
Originally it showed in both browsers but I was messing around trying to stop the image tiling.
I gave up on that and made the image bigger instead.
It looks great in i.e.6
Heres the css

#maincontent{
position: fixed;
top: 130px;
left: 0;
right: 0;
bottom: 0;
overflow: auto;
background: #fff;
background-image: url(../gatton archive/images/hop%20garden%205.jpg);
background-position: centre;
background-attachment: fixed;
}

Any ideas greatly appreciated

Thanks

Fred