Javascript - Event Handling

event.clientX, 
event.clientY, 
event.currentTarget, 
event.detail, 
event.eventPhase, 
event.explicitOriginalTarget, 
event.layerX
event.layerY
event.originalTarget
event.pageX
event.pageY
event.relatedTarget
event.screenX
event.screenY
event.target
event.preventDefault
event.stopPropagation

How to cancel an event

event.returnValue = false;
event.cancelBubble = true;
return false;

http://www.quirksmode.org/js/introevents.html