Flash Video not loading when my site is published

Hello.
I have a WebForm which has an ImageButton. When clicked, it will open a new window (using javascript). This new window,will load an html page (video.html).
Page.ClientScript.RegisterStartupScript(this.GetType(), "Open", "<script>window.open('Video/video.html','mywindow','menubar=0,resizable=1,width=420,height=310');</script>");

This html page contains a FLV Player, that loads a flv movie (myMovie.flv):
<body> <table width="500" border="0" align="center" cellpadding="0" cellspacing="0"> <tr> <td height="374" class="bgvideo"> <table border="0" align="left" cellpadding="0" cellspacing="0"> <tr> <td width="166" align="left" valign= ...