RBBH, If you right click your red x then click properties you will see that the link is to a website instead of a picture. I took the liberty of going to that website and opened the picture that I think you want in your signature.
Right clicked the picture, properties again, and bingo, theres the picture link.... I've posted the link below, just substitue this between your IMG /IMG in your signature.

http://pic4.picturetrail.com/VOL735/...3/65271765.jpg