Can't get hook_menu to work
'access callback' needs to be a function name. The function should return TRUE or FALSE;
From the API:

&quot;access callback&quot;: A function returning TRUE if the user has access
rights to this menu item, and FALSE if not. It can also be a boolean
constant instead of a function, and you can also use numeric values
(will be cast to boolean). Defaults to user_access() unless a value is
inherited from the parent menu item; only MENU_DEFAULT_LOCAL_TASK
items can inherit access callbacks. To use the user_access() default
callback, you must specify the permission to check as 'access
arguments' (see below).
&quot;access arguments&quot;: An array of arguments to
pass to the access callback function, with path component substitution
as described above. If the access callback is inherited (see above),
the access arguments will be inherited with it, unless overridden in
the child menu item.

This means you could ommit 'access callback' and use 'access arguments' instead:
// This will be true for users with the access content permission
'access arguments' = array('access content');