First off you create a photomontage, using stitching software, this you can then convert into a Quicktime VR movie, that you can embed into any website. The user then veiwing the movie can control where he look, even zoom in or out.
Depending on your OS, there are plenty of Apps, Realviz Stitcher being probably the most well known, you can try a demo, windows and OS X. An App I found recently is
Double take, OS X only, incredibly easy stitcher software.
Cubic Convertor is a good OS X app for making QTVR movies
But even better, this
site is the answer to your prayers, QTVR and you tube in one, everything can be done online, and it hosts your movies which you can embed