What is happening is that linux doesn't know how to run a .php file natively.
You need to install the php command line interpreter (CLI) and EITHER
rewrite your cron job as follows:
30 11 * * * php /home/pipsquea/www/thanx.php
OR keep the cron job the same and insert the following at the very top of your .php file:
#!/usr/bin/php -q
There's a tutorial here:
http://www.devarticles.com/c/a/PHP/PHP-CLI-and-Cron
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