text: /**
  * Author: Diego Montufar
  * Date: 13/02/2015
  * This THREEx helper makes it easy to handle the fullscreen API
  * it hides the prefix for each browser
  * it hides the little discrepencies of the various vendor API
  */
  
  /** @namespace */
  var THREEx		= THREEx 		|| {};
  THREEx.FullScreen	= THREEx.FullScreen	|| {};
  
  /**
   * test if it is possible to have fullscreen
   * 
   * @returns {Boolean} true if fullscreen API is available, false otherwise
  */
  THREEx.FullScreen.available	= function()
  {
  	return this._hasWebkitFullScreen || this._hasMozFullScreen;
  }
  
  /**
   * test if fullscreen is currently activated
   * 
   * @returns {Boolean} true if fullscreen is currently activated, false otherwise
  */
  THREEx.FullScreen.activated	= function()
  {
  	if( this._hasWebkitFullScreen ){
  		return document.webkitIsFullScreen;
  	}else if( this._hasMozFullScreen ){
  		return document.mozFullScreen;
  	}else{
  		console.assert(false);
  	}
  }
  
  /**
   * Request fullscreen on a given element
   * @param {DomElement} element to make fullscreen. optional. default to document.body
  */
  THREEx.FullScreen.request	= function(element)
  {
  	element	= element	|| document.body;
  	if( this._hasWebkitFullScreen ){
  		element.webkitRequestFullScreen();
  	}else if( this._hasMozFullScreen ){
  		element.mozRequestFullScreen();
  	}else{
  		console.assert(false);
  	}
  }
  
  /**
   * Cancel fullscreen
  */
  THREEx.FullScreen.cancel	= function()
  {
  	if( this._hasWebkitFullScreen ){
  		document.webkitCancelFullScreen();
  	}else if( this._hasMozFullScreen ){
  		document.mozCancelFullScreen();
  	}else{
  		console.assert(false);
  	}
  }
  
  // internal functions to know which fullscreen API implementation is available
  THREEx.FullScreen._hasWebkitFullScreen	= 'webkitCancelFullScreen' in document	? true : false;	
  THREEx.FullScreen._hasMozFullScreen	= 'mozCancelFullScreen' in document	? true : false;	
  
  