background image distorts / disappears in IE7

[Drain0]

I have applied a background image to a table TD but in IE7 it distorts/disappears when you click on the link to the page that you are on and scroll the page down and back up

I applied this to a TD

.bg {
background-image: url(../images/Untitled-4.jpg);
background-attachment: fixed;
background-color: #FFFFFF;
background-repeat: no-repeat;
background-position: center top;
height: auto;
}

Help please.

[edited by: jatar_k at 11:37 pm (utc) on Sep. 5, 2008]
[edit reason] no urls thanks [/edit]

[swa66]

You'll have to post more code, even with the image, I've no idea what "td" where the image is. Also add what you want to achieve (as "background-attachment: fixed;" is kinda unusual) (It's supposed to stay where it is when you scroll all the rest)