Background refreshing a controller from another page PHP(codeigniter)+Ajax

[sufi]

I want to refresh acontroller from another php page after specific intervals. The refresh will be a background process. End user never know there is a refresh from this page to another page.

I mean to say I want to refresh a specific page ('htdocs/exampleproject/controller/site.php') when user enter in to the htdocs/exampleproject/anypage.php. this all should be done in background i m working on localhost.. windows 7... basically my controller is checking whether there is any entry in a database table from Gsm module... if any then do some work on it...so i want to refresh this controller after every 4to 5 minutes

here is my controller

class Mydb_Controller extends CI_Controller {

public static $sender, $rep, $message, $bg, $loc;

function index() {
    $this->load->model('mydb_model');

    $data['result'] = $this->mydb_model->insertData();
    $data['bcresult'] = $this->mydb_model->getData();
    foreach ($data['bcresult'] as $row) {

        $GLOBALS['sender'] = $row->sender;
        $GLOBALS['message'] = $row->msg;
    }
    if ($GLOBALS['message'] == 'yes') {
        $data['bcReply'] = $this->mydb_model->getReply();

        foreach ($data['bcReply'] as $row) {
            $this->db->query("INSERT INTO `request_reply`(`sender`, `msg`, `r_id`, `requestee`, `reciever`, `msg`, `status`) VALUES ('" . $row->sender . "','" . $row->msg . "','" . $row->id . "','" . $row->requestee . "','" . $row->reciever . "','" . $row->msg . "','" . $row->status . "')");
            $this->db->query("INSERT INTO `dummy_out`(`requestee`, `reciever`, `blood_msg`, `status`) VALUES ('" . $row->requestee . "','" . $row->requestee . "','he is wiling to give.." . $row->reciever . "','send')");
        }
    } else {
        //echo $GLOBALS['sender'];
        $GLOBALS['bg'] = substr($GLOBALS['message'], 0, 2);
        $GLOBALS['loc'] = substr($GLOBALS['message'], 3, (strlen($GLOBALS['message']) - 1));

        $data['crresult'] = $this->mydb_model->bloodCall();
        foreach ($data['crresult'] as $row) {
            $this->db->query("INSERT INTO `dummy_out`(`requestee`, `reciever`, `msg`, `status`) VALUES ((SELECT sender FROM call ORDER BY id DESC LIMIT 1),'" . $row->cell_no . "','fgh','send')");
            echo'done';
        }
    }
}
} 

i want to refresh this controller after every 4 minutes in back ground