var appendMe = "<li><select ...></li>";
$('ul.roles').append(appendMe).find('select').click(...);

var message = new String();
if (XMLHttpRequest.responseText.length){
  message = jQuery.parseJSON(XMLHttpRequest.responseText).error;
...

var message = new String();
if (XMLHttpRequest.responseText.length){
  message = jQuery.parseJSON(XMLHttpRequest.responseText).error;
...

var messagesTable = $('#messagesTable');
var hoverTableRow = function () {
     messagesTable.find('tr.message')
...

function log(msg){
}

...