url node display

Hi,

I would like to know whether it´s possible to use an URL like "/example/%arg/%node" in Panels for overriding nodes.

The thing is that I´d like to organize the pictures of a gallery as follows:
- the node "photo" has a reference to node "category" via node reference.
- I use "Custom Pagers" module to navigate within the "photo" nodes.
- I want the navigation to be organized in two ways:

1= navigation by category with the URL "/gallery/%category/%node-photo". In this case, the pager will hold the navigation through all the pictures included in the same category.