If you have two switches controlling the light fixture, they are three-way light switches. Assuming that you wiring is correct, the problem is somewhere else. Depending on how the wires are run in the room, the problem might be in the light fixture. Replacing a switch shouldn't cause anything to blow unless the neutral wire was used in the switch by mistake. Either a neutral is wired in causing a short or the problem is somwhere else: Bad light fixture or even wires in the wall are breaking apart and touching. Your best bet may be paying for an electrician.
Jason, April 2009