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Falcon wrote:
img bbcode works just with this formats: .jpg, .jpeg, .gif, .png, .bmp.

the reason why phpfusion doesen't allow that url to work. is to protect you from hack attempts.

But i will look more into this problem and try to find a way, because i saw some forums, that allow this type of url images.

Till then, you should search for a new image hosting.
I will give you a list.
imageshack
photobucket
tinypic