$(document).ready(function()
{
  $('.account-information #signup-username').blur(function()
  {
    var username = $(this).val();
    
    $('.signup input[name="email"]').val(username);
    
    $.get(BASE + '/check_username.php?UN='+username, function(data) {
      $('#username-availability').html(data);
    });

  });
});