function onload() {
                /* Create sound with url.
                 * Note that sound is not actually loaded yet. So it is 
                 * recommended that you create all sounds that will be used
                 * later and load them when necessary. If the sound is not
                 * loaded when play, it will automatically load.
                 *
                 * Each element div can contain at most one sound.
                 * You may set those divs to be invisible if you wish.
                 */
                var engine = new jWebAudio.SoundEngine();
                var source = engine.addSoundSource({
                    'url': 'resource/a.ogg'
                });
                source.load(function() {
                    /* Play sound instantly */
                    source.sound.play();
                });
            }