$(document).ready(function() { 
	// this one requires the text "down", we define a default message, too
	$.validator.addMethod("antispam", function(value) {
		return value == "down";
	}, 'Please enter "down"!');
	
	// validate mail form on keyup and submit 
    var validator = $("#mailform").validate({ 
        rules: { 
            sender_name: "required",
            sender_email: { 
                required: true, 
                email: true 
            }, 
            check_sender_email: {
				required: true,
                equalto: "#sender_email" 
            }, 
			comments: "required",
			antispam: "antispam" 
        }, 
        messages: { 
            sender_name: "Enter your name",
            sender_email: { 
                required: "Please enter a valid email address", 
                minlength: "Please enter a valid email address"
            },
			check_sender_email: {
              required: "Please enter a valid email address", 
			  equalTo: "Please enter the same address as above"
			},
			comments: "What do you want to know?"
        },
		// set this class to error-labels to indicate valid fields
		success: function(label) {
			// set   as text for IE
			label.html(" ").addClass("checked");
		} 
    }); 
});