How To Make Reuseable HTML Navigation Menus?

Question

I\'m sure this topic comes up all the time,
But I can\'t seem to fine a concise answer.

I\'ve got a vertical menu bar that I want to reuse in webpages (>20)

Answer 1

If you would use PHP, all you have to do is use the include command, no coding beyond this one command.
Also, check out server side includes