1.
http://www.phys.unsw.edu.au/einsteinlight/click on maxwell
2.
http://en.wikipedia.org/wiki/Electromagnetismrelativity theory shows that in moving frames of reference a magnetic field transforms to a field with a nonzero electric component and vice versa; thus firmly showing that they are two sides of the same coin, and thus the term "electromagnetism".
3.
http://en.wikipedia.org/wiki/Relativistic_electromagnetism