I was baffled by the "hug" smilie

because I couldn't see anything that even resembled a hug. It looked like the pinkish smilie was about to give the greenish smilie a punch in the chops. Then today I happened to use Firefox instead of Internet Explorer and lo and behold, the smilie moves, reaches over and hugs the other smilie! So now I finally get it, but that leaves me with the question, why didn't it move when I used IE? Has anyone else noticed the same thing, or is it just a quirk of the settings on my IE?