Getting fallback pageid from template - help requested

Hi
I have a multilingual site with a small php routine in the template reading the filenames from folders to display some jpg's in a gallery, each page has a corresponding folder.
Everything works well, I use the template vars to get the pageid - my images folders are named like this
'folder_'.$objPage->id

This solution is great for one language however for my multilingual site, I would like to get the fallback pageid to avoid duplicating folders, how can I get this from the template, I had a look at "print_r($objPage)" but I can not see any relation to the fallback pageid from a second language.

Any help would be welcome

I have found the solution I think, this is $objPage->languageMain set to '0' for additional languages or to the fallback id for the primary language.