Help with function please

Hi all,

I posted previously but probably didnt ask the right way...so here goes. I have this xmlrpc code to post to wordpress, however I think i might be implementing it wrong as i cant get it to work. I have the right stuff enabled in wordpress and i can post using ecto (blog client) so i know the system works.

Would someone mind giving me an idiot proof instruction on how to call this function correctly ? Would appreciate it greatly.Thanks. Heres the code:

function wpPostXMLRPC($title,$body,$rpcurl,$username,$password,$categories=array(1)){
$categories = implode(",", $categories);
$XML = "<title>$title</title>".
"<category>$categories</category>".
$body;
$params = array('','',$username,$password,$XML,1);
$request = xmlrpc_encode_request('blogger.newPost',$params);
$ch = curl_init();
curl_setopt($ch, CURLOPT_POSTFIELDS, $request);
curl_setopt($ch, CURLOPT_URL, $rpcurl);
curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1);
curl_setopt($ch, CURLOPT_TIMEOUT, 1);
curl_exec($ch);
curl_close($ch);
}

Code (markup):