gistfile1.js

var create_callback = function(data) {
  var msg = "Hm, there was an error. Sorry!";
  if (data.status == 'OK') {
    msg = 'Great! Stay tuned!';
  } else {
    var errors = [];
    for(var i in data.errors) { 
      errors.push(data.errors[i]);
     }
     msg = errors.join("\n");
  }
  if ($('.sorry .message').length == 0) {
    $('.sorry').append($('<div>', { 'class': 'message' }));
  }
  
  $('.sorry .message').html($('<h3>', { text: msg }));
}
    
$('#notify_button').click(function() {
  BISPopover.create($('#notify_email').val(), 351612761).then(create_callback);
})