TextArea - HTML - img URL

I've got a textArea loading html from an external file.
The problem is with displaying images. Everything works fine
when the image URL is e.g.
http://www.domain.com/abc.jpg
(cross-domain, but no problem). When I change the URL to e.g.
http://www.domain.com/image.php?id=100
(I generate the images on-the-fly) nothing happen. HTTP header of
the generated image should be OK.
I've already spent ages on the issue. Any idea? Please help.
Thanks.

I've got it! Bloody hell!
The Image URL must have .jpg extension. So
http://www.domain.com/image.php?id=100&.jpg
works alright.
I promise, this is my last big project in Flash.

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