duno mate
just try using this one i will leave it on my account for ya

could have been that your img tags are lower case or the fact that i have miss spelt middle and you havent?
just copy and paste the one below (just remove the £ symbol if you want it to work! )

[IM£G]http://img2.photobucket.com/albums/v11/darren.cudd/3DOOR_SIG_midle.jpg[/IMG]