Use XMLRPC with CategoryID

Hi,

I use this function for publish posts using a php script outside the admin:

function wpPostXMLRPC($title, $body, $rpcurl, $username, $password, $categories, $keywords = '', $excerpt, $pubdate = '', $draftonly = false) {
$content = array(
'title' => $title,
'description' => $body,
'mt_allow_comments' => 1,
'mt_allow_pings' => 1,
'post_type' => 'post',
'date_created_gmt' => '%pubdate%', // Just as place holder here.
'mt_keywords' => $keywords,
'mt_excerpt'=>$excerpt,
'categories' => $categories
);
$params = array(0, $username, $password, $content, !$draftonly);

$request = xmlrpc_encode_request('metaWeblog.newPost', $params, array('escaping'=>'markup'));
// Now we need to set the real publishing date:
$request = str_replace('%pubdate%',
'' . $pubdate . '',
$request);

$ch = curl_init();
curl_setopt($ch, CURLOPT_POSTFIELDS, $request);
curl_setopt($ch, CURLOPT_URL, $rpcurl);
curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1);
curl_setopt($ch, CURLOPT_TIMEOUT, 1);
$results = curl_exec($ch);
curl_close($ch);
return $results;
}

I send categories as array through their name. But now, I need to send them through categoryID. Is it possible?

Can you help me modify this function for sending categories through ID ?