fires when the native 'onkeydown' event is triggered
Parameters:
inp - (object) the input element that fires the event
ev - (object) the event object
id - (string) the item id (the value of attribute name)
value - (string) the item value (for radios only)
myForm.attachEvent("onKeyDown",function(inp, ev, id, value){
//any custom logic here
});
Applicable to: input, select, btn2state checkbox, radio