Player 5 swf not showing up in IE6 web page

Could someone explain to me what might prevent a v5 swf from not playing properly in a web page in IE6 on a PC?.

Our home page is supposed to display a flash movie and for some reason it only displays the bottom layer. There are other movies that get loaded into the main movie and it is not happening. I’ve checked that the appropriate files are in the same directory. It works fine when we drag the movie onto the player on the desktop.

I’m not the web person who codes the site so I don’t fully understand the problem and am trying to help her.

Thanks for any suggestions
Rick