Browser -> Unity communication

Unity -> Browser works fine
Browser -> Unity isn't working.

In my .html file:

Code (csharp):

1.  
2. <script type="text/javascript">
3.     function CookiePrefs_init(name, callback) {
4.         var unity=u.getUnity();
5.         if ( unity ) {
6.             unity.SendMessage( name, callback, document.cookie);
7.         }
8.         else {
9.             alert('Could not find Unity. Preferences will not be loaded');
10.         }
11.     }
12. </script>
13.  

In CookiePrefs.cs

Code (csharp):

1.  
2. #if UNITY_WEBPLAYER
3.     /// <summary>
4.     /// Loads the preferences from the cookie.
5.     /// </summary>
6.     public void LoadPreferences()
7.     {
8.         Application.ExternalCall("CookiePrefs_init", transform.name, "_ReadCookiesCallback");
9.     }
10.  
11.     /// <summary>
12.     /// Callback for javascript to send the cookie to
13.     /// </summary>
14.     /// <param name="cookie_string">The cookie</param>
15.     public void _ReadCookiesCallback(string cookie_string)
16.     {
17.        if (cookieContents == null)
18.             cookieContents = new Dictionary<string,string>();
19.  
20.         string[] split  = cookie_string.Split(';');
21.         foreach(string element in split )
22.         {
23.             string[] key_value = element.Split('=');
24.             if(key_value.Length == 2 && !key_value[0].StartsWith("_utm"))
25.                 cookieContents.Add(key_value[0].Trim(), key_value[1]);
26.         }
27.         loaded=true;
28.     }
29. #endif // UNITY_WEBPLAYER
30.  

LoadPreferences is called from Start, the script is attached to an object named CookiePrefs which is at the root of my scene.
CookiePrefs_init gets called, u.getUnity() returns the correct result but SendMessage doesn't do anything.

I can't find anything useful, the only examples I find are for older versions of Unity so I'm starting to wonder if this isn't just borked in the current version.

 

According to:
http://docs.unity3d.com/Manual/UnityWebPlayerandbrowsercommunication.html

you may be missing some code to grab the actual unity object to send the message to...

Code (CSharp):

1.  
2. <script type="text/javascript" language="javascript">
3. <!--
4. //initializing the WebPlayer
5. var u = new UnityObject2();
6. u.initPlugin(jQuery("#unityPlayer")[0], "Example.unity3d");
7.  
8. function SaySomethingToUnity()
9. {
10.     u.getUnity().SendMessage("MyObject", "MyFunction", "Hello from a web page!");
11. }
12. -->
13. </script>