Simple Notifications

app.js

function notification(status, message, callback){

  var target = document.getElementById('mc_embed_messages');

  if(status === 500){
    target.innerHTML = '<span class="error-title">ERROR:</span> ' + message;
    target.className = "error";
    callback();
  }
  if(status === 200){
    (message);
    target.innerHTML = message;
    target.className = "success";
    callback();
  }

}
notification(500, 'It looks like something is wrong on our end, please try again.', function(res){});