Blizzard,
I suggest using
www.photobucket.com, which is a free service. This way you can store all of your digital pix in one place. They changed their guidelines recently so now you need to utilize the site at least once every 60 days or they will cancel your account. Just make sure you reduce the image size to at least 640x480 before you post a pic to this site or else it won't upload. If you want to add an avatar to your signature, that image can't be bigger than 140x90.