为什么auth_key参数为空?

vkontakte

link 应用程序。

这是我在网站内的应用程序标签:

<embed width="607" height="590" flashvars="api_id=1549899&amp;viewer_id=47745507&
amp;viewer_type=2&amp;user_id=47745507&amp;group_id=0&amp;is_app_user=1&amp;
auth_key=&amp;language=3" allowscriptaccess="never" allownetworking="internal"
allowfullscreen="true"
quality="high" name="player" id="player" style="" src="http://cs1830.vkontakte.ru  
/u47745507/13de6ae4d52c69.zip" type="application/x-shockwave-flash"/>

<embed width="607" height="570" flashvars="api_id=1457219&amp;viewer_id=47745507&
amp;viewer_type=0&amp;user_id=0&amp;group_id=0&amp;is_app_user=1&
amp;auth_key=2a3d8454de9f7a7ada0750050e686b01&amp;language=3" allowscriptaccess="never" 
allownetworking="all" allowfullscreen="true" quality="high" name="player" id="player" 
style="" src="http://cs4232.vkontakte.ru/u1304144/c1fd79dcbe47ec.zip" 
type="application/x-shockwave-flash"/>