Super simple ajax javascript dialog

dialog.js

document.observe('dom:loaded', function(){
  $('click_me').observe('click', function(event) {
    activateDialog(event);
  });
});

function activateDialog(event) {
  var element = Event.findElement(event);
  fetchDialogContent(element.href);
  event.stop();
}

function fetchDialogContent(url) {
  new Ajax.Request(url, {
    method:'get',
    onSuccess: function(transport){
      displayDialog(transport.responseText);
    }
  });
}

function displayDialog(content) {
  $('dialog').replace('<div id="dialog">' + content + '</div>');
  
  $('cancel').observe('click', function() { 
    dismissDialog(); 
  });
}

function dismissDialog() {
  $('dialog').replace('<div id="dialog"></div>');
}