I tried and it works, often, but in certain cases it doesn't.
For example if the plugin is called somewhere, like when you are browsing a gallery's pictures so you're in a page like "?album=1&gallery=1" it doesn't work.
That is the code: echo nggShowAlbum(1,null);
This displays correctly the album in a normal page, but if I click on the gallery (so I browse the pictures) the function doesn't work anymore.
I badly need to have AT THE SAME TIME the galleries on a menu and the pictures in the page's content.
So what can I do?