[DialogBox] Problem with lower corners

Hello Everybody,

I used the GWT Theme Generator [1] to generate kind of a gray style
with thin lines for our application.

Not I am facing the problem that the lower corners of a DialogBox look
kinda weird on IE7+ and FF 3.5+.

Please see these screenshots [2], [3] for an explanation.

As you can see within IE the corner are missing/wrong.
In FF the whole bottom is missing...

Honestly I have no idea why...

Any ideas or entry points for fixing/tweaking this behaviour?
Has anyone faced similar problems? And solved them!? ;)

Thanks in Advance for your help!

Greetings
Stefan

[1] http://works.sen-sei.in/gtg/

[2] http://starkeweb.org/files/dialogBox_ie7.jpg

[3] http://starkeweb.org/files/dialogBox_ff.jpg

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