How should I create text links which pop up

Hi All,

I have a client’s site which is, in parts, text heavy. Now, the client wants to have certain words have the ability to pop up an image from it like this:

‘from a series of works called ‘The Hidden Eye’ you can see that…’

The client wants ‘The Hidden Eye’ to be clickable so the viewers can see a small pop up with an image of ‘The Hidden Eye’. Exactly like an HTML page with an <a href= link in in.

Now I thought this would be simple but it seems I was wrong unless I’m missing something obvious!

Can anyone point me in the right direction.