swf file in product description

I have created a slideshow with slideshow pro for lightroom.
I've uploaded to the server and I can see the slideshow when I go to the live URL. so far it's all working fine.
But when I try to put it into the product description using the "insert/edit flash" icon I get a broken result. "Slideshow data not found. Check XML file path..."

I know the swf file is working when I open the url with the browser but I can't seem to get it to work inside the product description?
Do I have to update some js code or paths in the XML somewhere or what?
I also cannot get it to work in another simple php page from the template which I have added to the site. I added the swf file to the page using insert/media/swf in Dreamweaver.??
this flash stuff is all new to me so I may be missing something fundamental.

I also have an html file which shows the slideshow. if I cannot get the embeded swf file to work can I somehow include that html file inside the description?

I'd like to be able to do this without the expense of Powergallery if possible.

really appreciate the help, anyone?
Nancy