There is a known issue with using Novell Groupwise WebAccess with Safari. There is a toolbar that is supposed to appear on the left hand side of the screen that fails to appear when using Safari. I've found that if you click and hold on the brown strip on the left portion of the screen and then drag down, the toolbar will appear from the bottom of the screen.
Mac OS X Hints
http://hints.macworld.com/article.php?story=20040204214843264