Css help please

Hi guys,
I need my background image to not move off the screen when scaled dynamically. I want it so that the background image is centred and when someone reduces the browser window dynamically the background image is set to 0 0, so that it does move off the screen.

Does that make sense?

this is what I have so far:

body {
background-color: #000000;
background-image: url(images/bknd2.gif);
background-attachment: fixed;
background-repeat: no-repeat;
background-position: center top;
margin-left: 0px;
margin-top: 0px;
margin-right: 0px;
margin-bottom: 0px;
}
–>
</style></head>

to understand what I am talking about please go to
www.illicitrecords.net/test.htm and scale/reduce the browser to the left.

Jain