Firefox and CSS body tag

programming web dev
1 

body { 
background:url(CutUp%20Images/backgroundRepeat.gif) repeat-y  repeat-x;
background-position:center center;
background-attachment:fixed;
position:relative;
}

When I use this code in IE the background image appears fine and repeated but when used in firefox the background doesn’t even appear. Any ideas as to why firefox isn’t reading the body tag?

Thanks for any pointers.:look: