You must use a host that supports SSI such as
You must place the following code on every page you have that you have.
This is very important. Where it says "left.html" you need to insert the name of your menus. In my case, I named my menus left nav bar left.html and my affiliates aff.html. I then put the coding <!--#Include File="left.html"--> where i want my left nav to go and <!--#Include File="aff.html"--> where i wont my affilaites to go.
The next most important step is to name all your HTML files that you used the coding with, to change the .HTML extension to .SHTML if you dont do this the SSI wont work.
Reasons why your SSI may not work?
1. Your extensions are not .shtml
2. You didn't copy the code right.
3. Your host doesn't support SSI.
4. When you install your SSI into your webpage documents, make sure the right.html and left.html have NO html, head, body, or title tags. If those tags exist within you menu files, then the SSI will not understand what your telling it to do, and will not work properly.