codice:
$(document).ready(function(){
$("#form").validate({
	rules:{				
		campo1: {
			required: true,
			email: {
				depends: function (){return $("#tipo").val() == 2}
			},
			url: {
				depends: function (){return $("#tipo").val() == 3}
			}
		}
	},
	errorContainer: errorContainer,
	errorLabelContainer: $("ol", errorContainer),
	wrapper: 'li',
	meta: "validate"
});
});