$j.validator.addMethod("captcha", function(value) {	
	return value == "";
}, "Wrong answer");

$j(document).ready(function(){
	$j("#form").validate({	
		rules:{		
			fname: "required",		
			xname: "captcha",
			email:{
				required: true,
				email: true
			},
			comment: "required"
		},
		messages:{
			fname: "Please enter your name",		
			xname: "You've not given the right answer",
			email:{
				required: "Please enter your email address",
				email: "Please enter a valid email address"
			},
			comment: "The comment field is required"
		}
	});
});