This is a wrapper for Ryan Grove's LazyLoad enabling dynamic binding and exporting

Loader.js

/**
 * Loader is a wrapper around LazyLoad that resolves a requested library, loads it, and then when loaded it
 * fires a callback with the object exported by the library.
 *
 * Copyright (c) 2011 Scott Wilson <[email protected]>
 *
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are met:
 *
 *   * Redistributions of source code must retain the above copyright notice,
 *     this list of conditions and the following disclaimer.
 *   * Redistributions in binary form must reproduce the above copyright notice,
 *     this list of conditions and the following disclaimer in the documentation
 *     and/or other materials provided with the distribution.
 *   * Neither the name of this project nor the names of its contributors may be
 *     used to endorse or promote products derived from this software without
 *     specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
 * POSSIBILITY OF SUCH DAMAGE.
 *
 * @module loader
 * @class loader
 * @static
 * @version 1.0
 */

/**
 * The global object exports is used to hold exported library objects
 */
exports = {};

loader = (function(){
    /**
     * Resolves the requested library using the service registry
     * TODO implement
     * @param {String} name of library type required
     * @return {String} URL of matching library
     * @static
     * @private
     */
     function __resolve(library){
        if (library=="events") return "../faye.js";
     
        return "myscript.js";
        
        // Here is what we should do...
        // 1. Identify context data
        
        // 2. Send request to Service Registry API
        
     }

    /**
     * Loads the specified library and executes the specified
     * callback (if any) when they have finished loading with
     * the exported object
     *
     * @method load
     * @param {String} name of library type required
     * @param {Function} callback (optional) callback function to execute when
     *   the library has finished loading. This is executed with the exported object
     * @static
     * @private
     */
     function __load(library, callback){
            var scriptFile = __resolve(library);
    		LazyLoad.js(scriptFile, function(){
    			var exported = eval("exports."+library);
    			if (callback) callback(exported);
    		});
     };

     return {
    /**
     * Requests the specified library and executes the specified
     * callback (if any) when they have finished loading.
     *
     * @method load
     * @param {String} name of library type required
     * @param {Function} callback (optional) callback function to execute when
     *   the library has finished loading. This is executed with the exported object
     * @static
     */
            load : function(library, callback) {
                __load(library, callback);
            }
     };
}());