I’m not quite sure if you are familiar with ICQ. Well, if you aren’t then it’s an IM client like Yahoo messenger, MSN, etc. Unfortunately, like Yahoo IM it also displays ads and banners. If you find them annoying then you can get rid of them using a software- ICQ-Banner-Remover
ICQ-Banner-Remover is a freeware that removes advertisements and other annoying banners which are displayed in the chat window and contact list. Once you get rid of ads, you have less clutter and better space for chatting.