Smartie's suggestion is good as long as it hasn't affected you, if the banner already shows you might want to delete or rename the following .dll's on the ProgramFiles/ICQ directory:
icqateima32.dll
icqateimg32.dll
icqateres.dll
The upside is the banners are gone, the downside is the banner area is still there and on it is just blank gray with a "ICQAteBrowser Version 1.0" text.
But hey, anything to get rid of annoying banners. <g>