onKeydown

fires when the native "onkeydown" event is triggered

void onKeydown(object inp,object ev,string name,string value);

inp	object	the input element that fires the event
ev	object	the event object
name	string	item name
value	string	item value (for radios only)

myForm.attachEvent("onKeyDown",function(inp, ev, name, value){
    //your code here
});