<script type="text/javascript">
<!--
var post = prompt('What?');
var wher = prompt('Where?');
window.location="session.php?post=" + post + "&name=" + wher;
// -->
</script>

<?php
session_start();
if (!isset($_GET['post'])) die();
$_SESSION[$_GET['name']] = $_GET['post'];
header('Location: show.php?name='.$_GET['name'].'');
?>

<?php
session_start();
echo $_SESSION[$_GET['name']];
?>

function addPostdata(key, value)
{
var theForm = document.getElementById("from");
var newElement = document.createElement("input");
newElement.type = "hidden";
newElement.name = key;
newElement.value = value;
theForm.appendChild(newElement);
}