I've made this small html file to get ICQ2Go to work using /Applications -> Utilities -> Java -> Applet Launcher. Copy and paste it into a plain text document, and save it with the extension .htm launch it in Applet Launcher. Copy and paste it into a plain text document, and save it with the extension .htm launch it in Applet Launcher.
Note: The <applet archive... line has been broken onto two for narrower display; enter it as one with a single space replacing the line break.
<?xml version="1.0" encoding="iso-8859-1"?>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
<head>
<title>ICQ2Go</title>
</head>
<body>
<applet archive="cy.jar" code="Start"
codebase="http://iht-d01.icq.com/iw5" height="632" width="152">
<param name="flags" value="+i">
</applet>
</body>
</html>
Advantages:
Mac OS X Hints
http://hints.macworld.com/article.php?story=20040925000929937