if ($kind == 2){
  #previous record
  $stmt = "SELECT * FROM users WHERE user_id < (SELECT MAX(user_id) FROM users WHERE user_id < $rowpointer) ORDER BY user_id DESC LIMIT 1";
   
  }                                            
  
if ($kind == 3){
  #next record     
   $stmt = "SELECT * FROM users WHERE user_id > (SELECT MIN(user_id) FROM users WHERE user_id > $rowpointer) ORDER BY user_id ASC LIMIT 1";
   
  }