How to Load a model in my own created library

[eluser]Unknown[/eluser]
<?php
class Mylib
{
function show_lib()
{
$obj=& get_instance();
$obj->load->module('login_check');
$var=$obj->login_check->get_all_table_data();
print_r($var);

}
}

?>

ERROR:-
Fatal error: Call to undefined method CI_Loader::module()