as suggested futher up the thread, it should be
30 * * * * /usr/bin/curl -s -o /dev/null http://www.ashishtiwari.com/send.php
Alternatively in the panel, go to cron jobs, and enter
/usr/bin/curl -s -o /dev/null http://www.ashishtiwari.com/send.php
If that doesn't work, it's likely to be your code that's broken... try attaching debug vars, catching errors, and emailing the result to yourself via the mail() function (pass or fail with errors).
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