// use this for mysql-versions >= 4.1.0 instead, for better performance!
          mysql_query("INSERT INTO position (x,y,name) VALUES ('x','$y\text{'},\text{'}$name') ON DUPLICATE KEY UPDATE x='$x\text{'},\; y=\text{'}$y'");
          exit();
          
          /*
                  TODO remove inactive/old users from db.
  	*/
  ?>