gistfile1.js

(function(undefined) {
  if (window.Glow !== undefined) { return; }
  
  var Glow = function(version) {
    if (Glow.versions[version] !== undefined) {
      return Glow.versions[version];
    }
    
    var glow = function(arg) {
      if (arg.indexOf('<', arg) === 0) { return glow.dom.create(arg); }
      else return glow.dom.get(arg);
    };
    
    glow.version = version;
    
    glow.load = function(pack, version) {
      alert('load: '+pack+', '+version);
    };

    glow.dom = {
      create: function(s) { alert('create: '+s); }
      ,get: function(s) { alert('get: '+s); }
    };

    Glow.versions[version] = glow;
    
    return glow;
  };
  
  Glow.versions = {};
  
  window.Glow = Glow;
})();

(function() {
  var $ = Glow(2);
  alert($.version);
  $.load('widgets');
  $('*');
  $('<p>hello</p>');
})();

alert(window.$); // undefined