Users don't see the background on website

[JohnBeals]

I have a website running IIS. The pages use Cascading Style Sheets. Some users don't see the background on the web pages unless they refresh their screen by resizing the browser or opening another window over the browser. You can literally "paint" the background with a smaller window over the browser.

I am looking for the cause of this, and am wondering if anyone has seen this before, and if it's related to IIS or something else?

Here's the relevant code for the .css file.

BODY
{
BACKGROUND: #FFFFFF url(

http://MySite.com/LS/images/background.jpg)

no-repeat fixed top Left;
BORDER-BOTTOM: #c2d3dc groove;
BORDER-LEFT: #c2d3dc groove;
BORDER-RIGHT: #c2d3dc groove;
BORDER-TOP: #c2d3dc groove;
FONT-FAMILY: Arial, HELVITICA, 'Trebuchet MS';
MARGIN: 10px 0px;
font: normal normal;
font-variant: normal;
word-spacing: normal;
}

I am using TopStyle Lite to create the .css files, and can see the background in TopStyle Lite.
The background is always visible to me, it's other users that are having problems.

I have also tried this URL
BACKGROUND: #FFFFFF url(../images/background.jpg) no-repeat fixed top Left;
without luck.

Thanks,
JB