I have been trying to setup a cron job in Magento. I have been reading and followed the tutorials for a few. Now i do not understand what needs to be done to setup a cron job. I followed this tutorial http://inchoo.net/magento/creating-cron-script-in-magento/ however it did not work I tried a few others but they were no good either. Based on the reading on stackoverflow people seemed to use MAGE? to link to cron jobs however they are not clearly explaining how. I can not seem to understand what i need to add to make this work. Any suggestions
<crontab>
<jobs>
<customconfig>
<schedule><cron_expr>*/2 * * * *</cron_expr></schedule>
<run><model>customconfig/observer::cronEvent</model></run>
</customconfig>
</jobs>
</crontab>