Elcan Software

I have installed Feed2post 2.21 on Joomla 1.5.3 along with Cronjob 1.33. If I run the cronjob URL from the web browser it appears to work without error, but if I run it from the 'Scheduled tasks' section of my ISP's control panel I get the following errors:

/home/sites/REMOVEDFORSECURITY/public_html/cronstuff/cronjob.php: line 1: ?php
: No such file or directory
/home/sites/REMOVEDFORSECURITY/public_html/cronstuff/cronjob.php: line 2: /*
: No such file or directory
/home/sites/REMOVEDFORSECURITY/public_html/cronstuff/cronjob.php: line 3: cgi-bin: command not found
/home/sites/REMOVEDFORSECURITY/public_html/cronstuff/cronjob.php: line 4: unexpected EOF while looking for matching `''
/home/sites/REMOVEDFORSECURITY/public_html/cronstuff/cronjob.php: line 13: syntax error: unexpected end of file

(Note I've removed the domain name from the full path for security, but can PM any additional information as required).

The feeds are coming from a reliable source, and if I pull them in manually it works fine.

Any ideas?