Cancel, kill, murder a javascript event

Use this in a Javascript event handler to stop the event from continuing. Some events cannot be stopped, but the ones that can will be stopped by this in any browser.

function murderEvent(evt) {
 evt.cancel=true;
 evt.returnValue=false;
 evt.cancelBubble=true;
 if (evt.stopPropagation) evt.stopPropagation();
 if (evt.preventDefault) evt.preventDefault();
 return false;
}