How to use Postnuke & VB with one UserDB

[-=dm=-]

hehe easy?( u r talking to a newbie)

ok I did a cron and cronjob search on this forum and didnt found what I want.
can u please explain:

PHP Code:

<?php
//connect to database
mysql_connect("localhost", "yourDB", "yourPW"); // is this database username & pw or database name & pw?
mysql_select_db("your db");// here should go my database name right?
do I have to change anything below?
//empty pn userdb and fill it with fresh userdata
$query=mysql_query("delete from nuke_users");
$query=mysql_query("INSERT INTO nuke_users (uid,uname,email,url,user_sig,pass,user_icq) select userid,username,email,homepage,signature,password,icq from user");
$query=mysql_query("update nuke_users set umode='nested', theme='ExtraLite',timezone_offset='14.0'");

mysql_close();
?>

so I put this one in a php file and upload to http://www.mydomain.dk/portal/nuke/cron.php (right?)

Im very sorry Tom I know Im asking to many questions but u see Im a newbie and php is not me.

thanx in advance
dm