function addHandlers() {
	$('vehicle_make').addEvent('change',function(){
		setVehicleID(0);
		loadStep(0, {'vehicle_id': 0,
							'vehicle_make':$('vehicle_make').getValue() });
	});

	$('vehicle_model').addEvent('change',function(){
		setVehicleID(0);
		loadStep(0 , {'vehicle_make':$('vehicle_make').getValue(), 
							'vehicle_model':$('vehicle_model').getValue() });
	});

	$('vehicle_jato_id').addEvent('change',function(){
		loadStep(0, {'vehicle_make':$('vehicle_make').getValue(), 
							'vehicle_id':$('vehicle_jato_id').getValue(), 
							'vehicle_model':$('vehicle_model').getValue() });
	});
}