Php Cron Job Problem

I have set up a simple php page on my site to do
some everyday mysql database tasks for updating
the site.

I have run the script from a browser window and it works
however I tried doing a cron and I am not getting an email
to tell me the cron has been done and looking at the site it
looks like it hasn't been used.

I have tried both of these in my cron set up:

php -q /home/XXXXXX/public_html/cron_XXXXXX.php > /dev/null

/usr/bin/GET http://www.XXXXXXXX.com/cron_XXXXXX.php

I set the cron job to run at:

0 minutes
every other hour
every day
every month
every weekday

Niether appear to be working.

This is a short excert from the script:

<?php
include 'system/config.php';
include 'system/opendb.php';

mysql_query("UPDATE `XXXXXX`.`XXXXX` SET `intCategory` = '131' WHERE `intAuthorId` =39930
AND `intStatus` =0")
or die(mysql_error());

mysql_query("DELETE FROM `XXXXXX`
WHERE `textArticleText` LIKE CONVERT( _utf8 '%www.%'
USING latin1 )
COLLATE latin1_swedish_ci
or die(mysql_error());

include 'system/closedb.php';
?>

As I say the script works OK from a browser window so has anyone any idea
what I may be doing wrong.

Any help much appreciated.

Thanks

Terry