This image requires a reliable high speed connection to display properly, and some browsers have difficulty with zoom-able images. If the map does not appear, then try refreshing the page to re-activate it.
There are controls for pan and zoom, but these can also be done directly with click or touch movements.
Zooming in and out on touch devices is by 'pinch' and 'stretch'. If you are using a mouse with a wheel, then the wheel will zoom in and out, and click-hold-release will pan the image.