NaN output when loading external SWF

I am realatively new to Flash and just getting my feet wet, trying to do a project for school…just about done…then this happens…PLEASE HELP

I am trying to load external swf’s into my movie. Now, this is where it gets confusing…

Some of the external SWF files are just an image, they load fine, no errors. However, when I appempt to load teh movies which are image galleries, I get nothing, I press the Prev or Next buttons then I receive the NaN errors.

When the image galleries are played on their own, they work perfectly…it is just when I try to use the gallery inside the main movie is when NaN comes up…

Any suggestions???

These are the two things I am trying to use together…NOT a programmer to be…just want to make a neat presentation…used TWO tut’s from Kirupa they are the following:

http://www.kirupa.com/developer/mx/full_site.htm - main page

http://www.kirupa.com/developer/mx/photogallery.htm - photo gallery

Please any help would be most appreciated, thank you.