ChangeFix.js

if (!window.addEventListener) (function(){

Element.Events.keychange = {
	base: 'keyup',
	condition: function(e){
		var type = this.get('type'),
			key = e.key;
		if (type == 'radio')
			return (key == 'up' || key == 'down' || key == 'left' || key == 'right' ) && this.checked;

		return (type == 'checkbox' && key == 'space');
	}
};

var getBase = function(){
	var type = this.get('type');
	return (type == 'checkbox' || type == 'radio') ? 'mouseup' : 'change';
};

Element.Events.change = {
	base: getBase,

	condition: function(){
		return (this.get('type') == 'radio') ? ((event.type == 'keyup') ? this.checked : !this.checked) : true;
	},

	onAdd: function(fn){
		if (getBase.call(this) == 'mouseup') this.addEvent('keychange', fn);
	},

	onRemove: function(fn){
		var base = getBase.call(this);
		if (base == 'mouseup') this.addEvent('keychange', fn);
		this.removeEvent(base, fn);
	}
};

})();