function efect_on(camp){
	var anotherEl = $(camp);
	var morph = new Fx.Morph('biz');
	anotherEl.morph('.efect_on');
}

function efect_off(camp){
	var anotherEl = $(camp);	
	var morph = new Fx.Morph('biz');
	anotherEl.morph('.efect_off');
}