how to make php form autopost

[rek]

in checkout.php, I have a form submit to itself for validation.
If a payment method is not entered, it will come back in the same form and say "you forgot to choose payment method." (I got this part to work)
If payment method IS entered, it must post the method to the next page which is submit.php (How do I do this part without messing up the first part?)

here's what I have:

if(isset($_POST['submit'])) 
{
     if(empty($_POST['method']))
     {
    echo '<br><BR><font color=ff0000><small>You forgot to choose payment method</small></font><br />';
     }
     else	
    {

WHAT DO I PUT HERE?

}

}

<form action=checkout.php method=post>
<input type='radio' name='method' value='Purchase order'>Purchase order
<input type='radio' name='method' value='Credit card'>Credit card
<input type='submit' name='submit' value='submit'>

[Installer]

I'd say forget the post, do this:

$_SESSION['checkout_data'] = $_POST;
header('Location: submit.php');

[rek]

thanks for replying...
and now what do I put in submit.php?

I tried:

if(isset($_SESSION['payment']))
{	
     if(isset($_POST['method']))
          {
	$temp = $_POST['method'];
                echo "temp = $temp";
          }
                if($temp == 'Credit card')
                        {
                              echo "$temp";
                        }
                              else
	        {
	              echo "You did not enter a credit card number";
	        }
                 else if($temp = 'Purchase order')
	        {
                              echo "$temp";
                        }
                              else
	        {
	              echo "You did not enter a purchase order number";
	        }
}
else
{
         echo "no defined payment method <br />";
}

when all fields are filled correctly in checkout.php, the output I keep getting in submit.php is: "no defined payment method"

what am I doing wrong?

[Installer]

Did you put "session_start()" at the very top of "checkout.php" and "submit.php()"?

In "submit.php" change "$POST['method']" to "$SESSION['checkout_data']['method']".

What is "$_SESSION['payment']? Is "payment" what you used instead of "checkout_data"? If so, that's fine, just also substitute it in the change.