gistfile1.js

var Pool = function (name, value) {
  var self = arguments.callee;

  if ( typeof self.stash == "undefined" ) self.stash = {};
  if ( Boolean(name) === false ) return false; 

  var item = self.stash[name];

  if ( typeof value == "undefined" ) delete self.stash[name];
  if (value) self.stash[name] = value;

  return item;
};

Pool('aaaa', 'aaaaa');

alert(Pool('aaaa'));