//initialize validation
  validators = [
    $('#donation_amount').validate({ rules:{ amount: { required: true } } }),
    $('#personal_information').validate({ rules:{ Street: { required: true } } })
   ];

$('#btn-next').click(function() {
    //if validation is true, show next page
    if (validators[curOrder].valid()) {
      var old = $('.active');
      var oldOrder = old.attr('data-order');
      var newOrder = parseInt(oldOrder) + 1;
      old.removeClass('active');
      $("[data-order='" + newOrder + "']").addClass('active');
      curOrder = newOrder;
    }else{
      console.log("invalid");
   }
});