update profile photo(API)

Question

I want to update users profile photo.

require_once('facebook.php');


$facebook = new Facebook('..', '..');
$facebook->require_frame();
$user = $facebook->require_login();

//At first I get it
$fql = "SELECT pic FROM User WHERE uid=\"$user\"";

//this get profile url
$fql_result = $facebook->api_client->fql_query($fql);
//here
// get photo and change it 

$new_image = "***.jpg";//changed photo

$fql = "UPDATE User SET pic=\"$new_image\" WHERE uid=\"$user\"";

$fql_result = $facebook->api_client->fql_query($fql);

Are these steps correct.

Thank`s for help