[SOLVED] Session

[emediastudios]

Hi everyone

I have this code that i want to only run if the session is registered.

<?php
include_once('includes/include.php');

$themename=$_POST['themename'];
$query = "INSERT INTO theme SET themename='$themename'";
$result = mysql_query($query) or die(mysql_error());
header("Location: admin.php"); 


?>

what code would i put at the top of the file to stop anyone running this script, sorry but im a newbe.

[peranha]

<?php
if (isset($_SESSION['session_name_here'])) {
//  Code to be run here

}
?>