http://www.htmlcenter.com/tutorials/tutorials.cfm?id=155&type=PHP
users can do cron through cpanel
Backend

or

cd /var/spool/cron

crontab -e -u username
For cgi scripts
***** lynx --dump http://domainname/cgi-bin/script.cgi > /dev/null
For other scripts
***** lynx --dump http://domainname/path of the php script > /dev/null

Actuall the path of the script is saved as follows in a .sh file
lynx -dump http://www.website.co.uk/myscript.php

Suppose the above comand is saved in test.sh file
Then give the path to test.sh file in cron
1 * * * * /path/to/shell/file/test.sh

&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&
Through cpanel user can set cron. backend is in /var/spool/cron/username/
Example is given below.