asp classic - How to implement Server side include with navigation links -

I have 4 html pages. 1 of them is a common UI that should be available on all other pages.
Navigation page has 3 links which indicates the other 3 pages. I have used all three of these to include this common file
How do I handle the link clicking and changing the page accordingly? Can anyone help me in achieving this?

Thanks in advance victory

For this simple requirement, I You suggest using standard HTML iframe