Is it possible to insert css menu vertical on multiple pages

Q: I have your CSS3Menu program. Can I make a change in one place and have it reflects on all pages or do I have to go to each page to make the changes?

A: CSS3Menu doesn't provide possibility to insert menus on multiple pages.
You can use a server-side script (php, asp, vb, etc.) to generate html pages from templates on your server. Or you can use any CMS/web editor (Dreamweaver, Frontpage, Joomla, etc.) that allows to create templates.