Dirbar creates the row above that has the logo , the row of uplinks, and the searchbox.

Before writing its contents, dirbar checks $sp->errorURL. It will have been set if an erroneous URL was directed to a subdirectory of the current page. If errorURL is set, dirbar includes box404.php to display a red box with an error message atop the window.

The uplink directories follow the logo. They are computed by forPhyspics:getbarelts which consults the properties of each directory to find the name to display for that directory.