Mac MSIE won't hover

I have redesigned a page at
http://www.members.iinet.net.au/~abe.../TestMain.html so that it
works with MSIE 5.5 and 6, Mozilla, Netscape, and Opera for Windows,
and Safari for Mac OSX. It almost works for Mac MSIE 5.2 for OSX, but
only in this browser the links don't change colour or indent when one
hovers over them. What am I doing wrong? Is there a fix?

Is it because I have the left navigation div both floated and fixed?

Thanks in advance. Regards, Alex