Slideshow only works when I remove "www." from the domain

Hi,

Any idea why when I load the slideshow pro by adding the "www."
in front of my domain name the slideshow doesn't work and when
I remove it, it works.
I noticed in the code that imports the slideshow that the
"xmlfilepath=http://domainame.com" appears without
the www.
Is there a way to add the www. dynamically by looking at the current
domain name?

cheers!