Some elements not displaying backgroung image in IE6&7

[shocker]

This is odd because two different divs that use the same css declaration for background images are displaying differently

See my page:
Nahid Fashions

As this page loads in IE6&7 you should see several the background images. On the side boxes to the right a gradiant dark grey background image is displayed for most of the side boxes. They all use the follow CSS declaration

.sideBoxContent 
 {background: url(../images/1X170_sidebox.png) repeat;}

However, the sidebox with the heading "Information" does not display the background image once the page fully loads.

The problem also affects the left side of the page where the product information is displayed (the gradient grey dark grey is not displayed). The best way to see this is in FireFox where background images displayed properly.

I'm at a lost as to how to attack this problem because I don't see a logical thread to follow.

[kuroi]

I'm not seeing this problem in IE6 or IE7. Have you resolved it?