OT cron/perl/php..

I've found a really handy php script (mysqlphpbak) that will backup all mysql databases for me via mysqldump. I'm using a cobalt raq server, and according to them, I can create a script and put it in a cron-daily directory, and that script will be executed. How do I create that script? Does it have to be in perl, and if so, how would you code it? Or could it be a php file? Sorry for the exceedingly off-topic post, I'm obviously new to the sysadmin side of things... Kelly