Html pop up tutorial with site using load movie

I am trying to impelement several html pop up windows from within a flash site using the centered pop up tutorial on this site.

the html pop ups work fine when previewing the individual .swf files which they are contained.

However. I am using the Load movie command to load seperate .swf files into a main site swf file. When the sub sections are loaded into the main swf file and I preview in a browser, I am unable to get the html pop up buttons to function properly.

I Imagine this could be something to do with the main flash file not recognising the scripting contained within the sub .swf file, does any body have any idea how I can get this to work.

any help would be much appreciated.

Thanks

Jack