prova a vedere questo:
<script>
var valida = $("#registraform").validate({
messages: {
firstname: "Enter your firstname",
lastname: "Enter your lastname",
username: {
required: "Enter a username",
minlength: jQuery.format("Enter at least {0} characters"),
remote: jQuery.format("{0} is already in use")
},
password: {
required: "Provide a password",
rangelength: jQuery.format("Enter at least {0} characters")
},
password_confirm: {
required: "Repeat your password",
minlength: jQuery.format("Enter at least {0} characters"),
equalTo: "Enter the same password as above"
},
email: {
required: "Please enter a valid email address",
minlength: "Please enter a valid email address",
remote: jQuery.format("{0} is already in use")
},
dateformat: "Choose your preferred dateformat",
terms: " "
},
});
</script>
vedi il codice completo qui:
http://jquery.bassistance.de/validate/demo/milk/
spero di aver capito giusto!