Moz does not position CSS bg

In Moz, there's a bizzare lack of background (or better say I guess it is positioned otherwise) on the left menu at

http://mc2.magic.fr/damiantest/index.php

the CSS class is used in cell was

.bgleft {
background-attachment: fixed;
background-image: url(img/bgmenu.gif);
background-repeat: no-repeat;
background-position: left top;
height: 277px;
width: 234px;
}

Same with

http://mc2.magic.fr/damiantest/template.php where I have another bg

the css file is in the same root with index, thus I guess the img's url is ok

Does not Moz catch this? IE sees it OK. Any ideas?

Fixed

It looks like Moz don't like fixed value to attachment, and, anyway, IE uses that for body only, thus it was useless in a cell

.bgleft {
background-image: url(img/bgmenu.gif);
background-repeat: no-repeat;
background-position: left top;
height: 277px;
width: 234px;
}

and it works now in both browsers