get_array_element

get value of array element
     tag     - tag of array, specifies one of two
               array types AR_...
     id      - array id
     idx     - index of an element
returns: value of the specified array element.
         note that this function may return char or long
         result. Unexistent array elements give zero as
         a result.

string or long get_array_element(long tag, long id, long idx);

#define AR_LONG 'A'     // array of longs
#define AR_STR  'S'     // array of strings