using hooks to generate dynamic template vars

[puck916]

I have a hook like below:

<?
$server   = "localhost";
$database = "voice";
$server   = "localhost";
$user     = "root";
$password = "";
$dborig = mysql_connect($server,$user,$password);
mysql_select_db($database,$dborig);
$stats = array();
$sql = "SELECT COUNT(*) as count FROM account";
$result = mysql_query($sql);
$row = mysql_fetch_array($result);
if($row){
	$stats["registered"] = $row['count'];
	$registeredusers = $row['count'];
}

mysql_close($dborig);


?>

I want in my header template to either be able to put $registeredusers or $stats['registered'] and have it display the result.

How can I do this. I have my hook running successfully. I just cant figure out how to get the template var replaced.

Thanks

nobody?