This is dues to IE which doesn't support PNG transparency. What you can do is : - Do not use anymore IE : Firefox is a good alternative. - Wait for the next IE release : IE7 - Convert the smileys in GIF (but it will notbe very nice because GIF support only 2 transparency level) - Do not use these smileys.
can these 2 also help because these 2 can make it seems like no problem the picture background not transparent but the background same as the chat background