CSS in IE: Background image position is not updated on ajax update

I have 2 DIVs - when the upper DIV gets replaced by a higher DIV (using AJAX), the content of the lower DIV gets pushed down just like it should, but not the (repeated) background image:

background: url("../images/background.png") repeat-y scroll 0 0 #E6E6E6;

Th开发者_如何学Gois only happens in IE (7, to be precise).

What could be the problem here?

Thanks for any help with this!

Tom

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The problem is/was related to the use of the .htc solution (rounded corners, cross-browser: http://code.google.com/p/curved-corner/downloads/list).

So no solid rounded corners in IE <= 7 without images.