Yay I think I've got it figured out for you
Just put the following command in your signature and delete the space in the [IMG ] command:
[IMG ]http://i370.photobucket.com/albums/oo143/Chris0993/P51D-animationblur_optimised.gif[/IMG]
Then it should look like this:
Not bad for a 31 year old computer n00b eh?