Can I set $_POST without using a form?

[frog]

On my weblog I have a page with a form where I enter a blog and then submit this to my main page where it is stored on the database and then displayed along with all the other blogs for the month.
This is all good and dandy, however if I then hit [refresh] the same $POST values are processed and I get a duplicate database entry. Is there any way that I can set $POST data without having to use a form? I have tried to do it as below but this is not working....

$action_store_blog = $_POST['action_store_blog'];

if ($action_store_blog) 
				{ 
				$blog_text_area = $_POST['blog_text_area'];
				store_blog($blog_text_area);
				$_POST['action_store_blog'] = false;
				}

[cosminb]

you can set blog column in your database to be unique. you wont get duplicate entries that way.

or

you can throw a header("Expires: ......")

[frog]

Well, I wondered what I could use header() for, and it works a treat, thanks.

<?php
header("Expires: Mon, 26 Jul 1997 05:00:00 GMT");
//default.php
//The home page for markbeal.co.uk

By the way, my blog column in the MySQL DB is of type BLOB, I can't set it to be unique.

[cosminb]

Originally posted by frog
By the way, my blog column in the MySQL DB is of type BLOB, I can't set it to be unique.

didn't knew that ...