Is right click a Javascript event? If so, how do I use it?
Yes, oncontextmenu is probably the best alternative but be aware that it triggers on mouse down whereas click will trigger on mouse up.
Other related questions were asking about double right click - which apparently isn't supported except through manual timer checking. One reason you might want to be able to have right double click is if you need/want to support left-handed mouse input (button reversal). The browser implementations seem to make a lot of assumptions about how we should be using the available input devices.