IE8 & IE9 Validate in conjunction with placeholder fix

gistfile1.txt

(function($) {
    $('[placeholder]').focus(function() {
      var input = $(this);
      if (input.val() == input.attr('placeholder')) {
        input.val('');
        input.removeClass('placeholder');
      }
    }).blur(function() {
      var input = $(this);
      if (input.val() == '' || input.val() == input.attr('placeholder')) {
        input.addClass('placeholder');
        input.val(input.attr('placeholder'));
      }
    }).blur().parents('form').submit(function() {
      $(this).find('[placeholder]').each(function() {
        var input = $(this);
        if (input.val() == input.attr('placeholder')) {
          input.val('');
        }
      });
    });
    $.validator.addMethod('notPlaceholder', function(val, el) {
        return this.optional(el) || ( val !== $(el).attr('placeholder') );
    }, $.validator.messages.required);
    $('#quick-quote').validate({
        rules: {
            clientname: {
                minlength: 3,
                required: true,
                notPlaceholder: true
            },
            housenumber: {
                minlength: 1,
                required: true,
                notPlaceholder: true
            },
            postcode: {
                minlength: 3,
                required: true,
                notPlaceholder: true
            },
            telephone: {
                digits: true,
                required: true,
                notPlaceholder: true
            },
            email: {
                minlength: 4,
                required: true,
                email: true,
                notPlaceholder: true
            }

        },
        highlight: function(element) {
            $(element).closest('.form-group').addClass('has-error');
        },
        unhighlight: function(element) {
            $(element).closest('.form-group').removeClass('has-error');
        },
        errorElement: 'span',
        errorClass: 'help-block',
        errorPlacement: function(error, element) {
            if(element.parent('.input-group').length) {
                error.insertAfter(element.parent());
            } else {
                error.insertAfter(element);
            }
        }
    });
  })(jQuery);