Please Help --- SSI problems

hello... This is the webpage I am building: http://www.wgbd.org/discipuladohoy/index.html

To add the menu on the right side, I am using the the following code:

so i do not have to change the menu on Every Single Page whenever I add to it.

It works great in my computer, when I view it in Int. Explorer, on Windows XP

Netscape doesn't show the Include at all. :/

I tried using the command, but even with .asp and .shtml extensions, could'nt get that to work at all, in either broswer.

I do not use PHP. The person who owns this site doesn't want to use javascipt, because not everyone has it enabled.

How can I do this? Is it just something I'm doing wrong? Can someone look at my page and test somethings and give me some absolutes that will work in Netscape and IE?

if so... Thank you!