Icons not in color in Netscape 4.6 and 4.7

[Michael Roberts <roberts@sgi.com>]

I'm having a problem with netscape and I've tried both versions 4.6 and
4.7 with the same results - all the icons on the buttons and elsewhere
are in black and white, not color.  This is a fresh install of potato
I'm running on.  All the shared libraries netscape needs are present. 
What am I missing here?

Mike Roberts