The different coloured buttons indicate:
Name - Clicking on the button will open data for this item in this frame.
Name - There is no image for this object, but moving your mouse over the button will highlight the object in the image.
Name - There is an image for this object, moving your mouse over the button will highlight the object in the image, clicking on the button will open the image.
Move your mouse over a Building/Object in the image, if it hi-lights, a Title will appear giving a brief description, click on the highlighted area and an image will appear for that object. This only applies to some buildings in the image.
If a coloured border box is shown anywhere in the image clicking on the Box View button above the image will open an image for that area or clicking inside the box will open a new page with a zoomed in view of that area showing buildings not clearly seen in the image below.