Let's play a game!!! - member pictures

[Banana_juice]

why is it saying this when i try to post it.

You are not allowed to use that image extension on this board. A valid format is: <!-- m --><a class="postlink" href="http://www.domain.com/picture.gif">http://www.domain.com/picture.gif</a><!-- m -->, an invalid format is: <!-- m --><a class="postlink" href="http://www.domain.com/picture.one.gif">http://www.domain.com/picture.one.gif</a><!-- m -->