added a new serializer - the "empty" serializer, for those widgets who don't
need a serializer (like the TooltipWidget for instance).
<div id='Ldt-PlaceHolder'>
<a href='http://www.adobe.com/go/getflashplayer'>Get flash</a> to see
this player
</div>
<div id='Ldt-controler' class='demo'>
<div class='Ldt-Control1'>
<button id='ldt-CtrlPlay'>Lecture
/ Pause</button>
<button id='ldt-CtrlNext'>Suivant</button>
</div>
<div id='Ldt-Annotations' class='ui-slider'>
<div id='slider-range-min'></div>
</div>
<div class='Ldt-Control2'>
<button id='ldt-CtrlSearch'>
Rechercher</button>
<button id='ldt-CtrlSound'>Sound</button>
</div>
<div class='cleaner'> </div>
<div id='Ldt-Show-Arrow-container'>
<div id='Ldt-Show-Arrow'></div>
</div>
</div>
<div id='Ldt-Ligne' class='demo'>
<div class='cleaner'></div>