$(document).ready(function(){
  
  // validate signup form on keyup and submit
  jQuery.validator.addMethod("phoneUS", function(phone_number, element) {
    phone_number = phone_number.replace(/\s+/g, "");
    return this.optional(element) || phone_number.length > 9 &&
    phone_number.match(/^(1-?)?(\([2-9]\d{2}\)|[2-9]\d{2})-?[2-9]\d{2}-?\d{4}$/);
  }, "Please specify a valid phone number");
  
  $("#contactform").validate({
    rules: {
      phone: {
        phoneUS: true
      } // end phone
    } //end rules
  }); // end #contactform validate
});