A lot of sites won't let you hotlink, so in that case, I suggest the following...
download the smiley to your pc, then upload it to a free photo album, msn does one, so does photobucket, and I'm sure there are LOADS of others too..
Then hotlink your image from there instead
Oh, there's also a really great free online site if you want to customise your animated gifs at gifworks.com