General Support: Those Breadcrumbs Again

I see there have been a few questions about breadcrumbs already but they don't quite answer what I'm after so I'm hoping someone can help...

I need to maintain a value of 'location' encoded in the URL of any link that plogger generates. Using Crimson Edit, I've managed to get it so that this works when you select the album from the breadcrumbs but, because the 'Collections' part uses $_SERVER["PHP_SELF"], I'm not sure how to inject this value.

Should I simply change $_SERVER["PHP_SELF"] to an absolute path to my index file including my value?

Any pointers much appreciated!

Matt