Load function on every page

[eluser]comyou[/eluser]
Hello all,

I current want to run a function to check if the logged in user is an admin everytime a new page is loaded.

My function is

Code:

function check_admin() {
    $logged_in = $this->session->userdata('logged_in');
    if ($logged_in == TRUE) {
        $this->get_where_custom('username', 'admin');
        foreach($query->result() as $row) {
            if ($row->num_rows() == 0) {
            $this->session->unset_userdata('is_admin');
            $this->session->set_userdata('is_admin', FALSE);
            } else {
            $this->session->unset_userdata('is_admin');
            $this->session->set_userdata('is_admin', TRUE);
            }
        }
    }
}

However I'm not sure if this is working properly but I could always fix that once it loads on every page.
The function is found in my 'application/modules/secure/security.php'

I've tried putting it in a helper file (but being honest, I wasn't really sure what I was doing.

How would I load the function when every page loads?
Thanks in advanced.