Alright, this one is a bit tricky. I'm using the theme() function and theme_links__system_main_menu to render the main menu in a specific way on the front page. All the menu items link too basic pages.
The idea is that when hovering over a menu item, a pop-up appears with the content of a field called 'Preview' that's on the basic page of which the menu item is linked to. The pop-up itself is a simple CSS thing, so what I'm looking for is a way to access the information of the node in question.
I know $variables contains the link to the node, is there perhaps a function that gives you node information by link?