jQuery.validator.addMethod("lettersonly", function(value, element) {
return this.optional(element) || /^[a-z ]+$/i.test(value);
});

$(document).ready(function(){
$("#contactForm").validate({

errorContainer: "#errorBox",
   errorLabelContainer: "#errorBox ul",
   wrapper: "li",

rules: {
   user: {
	required: true,
	lettersonly: true,
	maxlength: 24
   },
   email: {
	email: true,
	required: true,
	maxlength: 24
   },
   message: {
	required: true,
	maxlength:500
   }
   },
messages: {
	user: {
		required: "! Please enter your name.",
		lettersonly: "! Letters only please."
	},
	email: {
		email: "! Please enter a valid email address.",
		required: "! Please enter a contact email address."
	},
	message: {
		required: "! Please enter a message.",
		maxlength: "! Message is limited to 500 characters"
	}
	}
});
});