Thanks, Mike.
Reckon I'm almost there. Changed the SQL in the feature layer view to generate html using IFrame.
Have enclosed 2 screenshots of the front of the council building.
As you can see on one screenshot, the popup opens to the given size.
However you can see on the second screenshot that if I make the popup larger, the interactive page from the cyclomedia server stays the same size with the result that I only gain white space on two sides.
Can you also help me with this problem?