How to restrict time peried for posting a form from a website?
<p>On my website I included a post card that users can send from my site.  I want to restrict based on IP (from one computer) only 5 post cards can be sent in 30 minutes.  If an IP is trying to send their 6th postcard, the page should redirect to the registration page.</p>

<p>I am not a php script writer.  I don't know heavy PHP.</p>
