wrote our own pubsub system because of a bug in the jquery one
(see http://jsfiddle.net/khamidou/PuUjj/2/)
{{! template used by the jquery ui tooltip }}
<div class='Ldt-tooltip'>
<div class='title'>{{title}}</div>
<div class='time'>{{begin}} : {{end}} </div>
<div class='description'>{{description}}</div>
</div>