Sure :) ... are you planning on making the whole image click-able or only a part of the image?
In the first case, simply place your image code like <img src="http://url.to/your.jpg" /> instead of the anchor text 'form'.
In the second case, you will need to make an image map where you can define one or more zones or parts of the image that will be linked to whatever you want. Search on the internet for how-to's or one of the online image map creation tools to make you image map.
To see an example, go to http://demo.4visions.nl/easy-fancybox-sandbox/ and scroll a bit down to the large map of a garden and a ground floor of a building with sauna and swimming pool. Different areas link to different content, all opening in FancyBox.
Hope that gives you some ideas to work with :)