code: function(el){
  		if(el instanceof FancytreeNode){
  			return el; // el already was a FancytreeNode
  		}else if(el.selector !== undefined){
  			el = el[0]; // el was a jQuery object: use the DOM element
  		}else if(el.originalEvent !== undefined){
  			el = el.target; // el was an Event
  		}
  		while( el ) {
  			if(el.ftnode) {
  				return el.ftnode;
  			}
  			el = el.parentNode;
  		}
  		return null;
  	}
docs: Return a FancytreeNode instance from element.
  
  @param {Element | jQueryObject | Event} el
  @returns {FancytreeNode} matching node or null