$(function() {
    
    $("#newsletterForm").validate({
        errorLabelContainer: "#feedbackNewLetter",
        rules: {
            email: {
                required: true,
                email: true
            }
        },
        messages: {
            email: "Vueillez entrer une adresse email valide"
        }
    });
    
    var first = true;
    $("#newsletterField").focus(function() {
        if(first) {
            first = false;
            $(this).val("");
        }
    });
    
});