I know this question was asked some time ago, and the orginal poster may have an answer by now, but I thought it might help someone (like me) who searched for info on cron jobs...
All you have to do setup a cron job with something like this as the command:
lynx --dump
http://www.yoursite.com/yourpage.php >/dev/null
This cause the lynx browser to "view", just like any web user would then dump the output to /dev/null (nowhere...). If the script resides in a password protected area, you can do this:
lynx -auth=user : pass --dump
http://www.yoursite.com/yourpage.php >/dev/null
(remove spaces before and after : added to prevent creating a bbcode)
When the cron job runs, so will will your script.
Hope this helps!
David Hamilton