Hello Dave

Yes - this can be done.

On the page where you have the list, you should also have an iframe you give an ID/name.

Then in the listb make a targeted link that opens in the iframe.

I have an example:

Herer: https://www.bramminginfo.dk/sneum-digeso.html

Near bottom of the page is a blue bar.

Clicking this bar "Klik her for at vælge en video...."

Clicking the bar will open a list.

Clicking on a line in the list (the list could have been made with more fields) will open the YouTube link in the iframe below.

Hope it was something like this you meant

Another way could be to use a database, where you to the left show a list of records - and then to the right show a detail view of a record that is selected in the list.

Example of that here: http://eksempelsite.dk/udstillinger/Udstilling_view.php

I studied your map-image one more time.

If what you want is a link in the detail view that opens a map, then you could have another iframe or use the same.

The link could be constructed as they show here: https://www.w3schools.com/tags/att_a_target.asp

You could also in the detail view have an iframe that shows the map.

Is your data coming from a CSV-file or a database or...?

You could also use something like this: https://pindown.eu/predemo/index.php?fpath=pdfiles

Try the "List view" and then imagine that it was the detail information you saw. Then try to click on a marker/image and see a fly to the location.

There is a lot of possibilities - the difficulty is to find the right one.

Thanks John,  I've been distracted as something more impotant (and urgent!) turned up.  I won't get a chance to look at this now until next week.  I will keep you informed.

Dave

PS data from mySQL database