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function refresh() {	global $db, $api_key, $secret;	$fb = new FacebookRestClient($api_key, $secret);	$users = $db->get_results("SELECT * FROM lulzkitteh_users");	foreach($users as $user) {		$fb->session_key = $user->session;		$url = get_image_url();		$string = "<center><img src='$url' /></center>";		$fb->profile_setFBML($string);	}}