Pop-up image from link?

My apologies if this has already been asked.

I'm trying to create a URL link on a page, but instead of it linking to another page on my website, I want it to simply link to an image. How do I do this?

I know how to create a url link that links to another part of my website.

The text will say “Time-Table” and when they click on that linked text, it brings up a pop-up window that shows an image.

Thanks for the help

You could use the same principles from the very simple image gallery I posted previously.