on FF 3.6 with no flash, onLoad event is not triggered

code to reproduce the error:
                    soundManager.createSound({
                        id: 'mysound',
                        url: '/sounds/mysound.ogg',
                        autoLoad: true,
                        autoPlay: true,
                        onload: function(){
                           alert('loaded');
                                }
                    });
adding s._a.load(); on line 2937, triggers the onload event.

script/soundmanager2.js

@@ -2934,6 +2934,7 @@ function SoundManager(smURL, smID) {
         if (instanceOptions.autoLoad || instanceOptions.autoPlay) {
 
           s._a = new Audio(instanceOptions.url);
+          s._a.load();
 
         } else {
 
@@ -5938,4 +5939,4 @@ if (window.SM2_DEFER === undefined || !SM2_DEFER) {
 window.SoundManager = SoundManager; // constructor
 window.soundManager = soundManager; // public API, flash callbacks etc.
 
-}(window));
+}(window));