v0.9.2 : 11/04/07
 - added options leftOffset et topOffset for relative positionning against
 the relative element (Jonathan Poissant)
 - added setPosition method for absolute positionning (Jonathan Poissant)
 - added relativePosition to activate/desactivate relative positionning
 - some code clean-up

v0.9.1 : 13/03/07
 - replace locale by language (RobG)
 - add support for german language (Kjell Bublitz)
 - add support for portuguese language
 - use Prototype.emptyFunction when clickCallBack not defined, should fix
 possible bug with IE and null objects (Gareth Evans)
 - some code clean-up using Builder.node

v0.9 : 11/03/07
 initial release