public/javascripts/yui/event/event-debug.js
function (el, fn, obj, overrideContext) {
                return this.on(el, FOCUSOUT, fn, obj, overrideContext);
            }
function (el, fn, obj, overrideContext) {
                return this.on(el, FOCUSOUT, fn, obj, overrideContext);
            }
function ( el , fn , obj , overrideContext ) { return this . on ( el , FOCUSOUT , fn , obj , overrideContext ) ; }
Attaches a focusout event listener to the specified element for
the purpose of listening for the blur event on the element's
descendants.

@method addBlurListener

@param {String|HTMLElement|Array|NodeList} el An id, an element
reference, or a collection of ids and/or elements to assign the
listener to.
@param {Function} fn        The method the event invokes
@param {Object}   obj    An arbitrary object that will be
passed as a parameter to the handler
@param {Boolean|object}  overrideContext  If true, the obj passed in becomes
the execution context of the listener. If an
object, this object becomes the execution
context.
@return {Boolean} True if the action was successful or defered,
false if one or more of the elements
could not have the listener attached,
or if the operation throws an exception.
@static
@deprecated use YAHOO.util.Event.on and specify "focusout" as the event type.
Attaches a focusout event listener to the specified element for the purpose of listening for the blur event on the element s descendants .