Another method would be to use a webviewer and create an image map for your image. This has the advantage of being more easily scrollable and zoomable. You then use the webviewstring to return what has been clicked (or develop the whole thing in html...)
There is also an image map extension
Whichever route you choose, you will have to work out the coordinates for each room so that a user can click and get the image and other data to display.