HELP!SWF not playing when embedded in HTML

:worried: I made a flash movie that has a preload bar in the first scene. The entire swf is only 33K. When I test the movie in the Flash environment and even simulate download at 14.4 speed, everything works properly. Preload bar shows up and then plays the movie when it is finished loading. However, when I embed the swf in my html, nothing happens. The stage shows up, but nada…no preload bar, nothing. Why?? What can I do to fix this?? Please HELP!!