Hvordan laver man cookie/session på en radiobutton?

Det her skulle virke.

side1.php:

<form action="side2.php" method="POST">
  Ja <input type="radio" name="gave" value="ja" />
  Nej <input type="radio" name="gave" value="nej" />
</form>
_____________________________________
side2.php:

<?php
session_start();

if(isset($_POST["gave"]) && $_POST["gave"] == "ja"){
  $_SESSION["gave"] = "ja";
}
elseif(isset($_POST["gave"]) && $_POST["gave"] == "nej"){
  $_SESSION["gave"] = "nej";
}
else{
  $_SESSION["gave"] = "";
}

?>

//mcardle

Lidt rettelse og har tilføjet cookie, samt en test side:

//Side 1:

<form action="side2.php" method="post">
  Ja <input type="radio" name="gave" value="ja" /> - Nej <input type="radio" name="gave" value="nej" /><br />
  <input type="submit" value="Skift" name="change" />
</form>

//Side 2:
<?php
session_start();
if(isset($_POST['gave']) && $_POST['gave'] == 'ja')
{
    $_SESSION['gave'] = 'ja';
    //eller
    $_COOKIE['gave'] = 'ja';
}
else
{
  $_SESSION['gave'] = 'nej';
  //eller
    $_COOKIE['gave'] = 'nej';
}
?>

//Side 3:
<?php
session_start();
echo 'SESSION: ' . $_SESSION['gave'] . '<br />';
echo 'COOKIE: ' . $_COOKIE['gave'] . '<br />';
?>

Og side 2 skal jo selvfølgelig være:

//Side 2:
<?php
session_start();
if(isset($_POST['gave']) && $_POST['gave'] == 'ja')
{
    $_SESSION['gave'] = 'ja';
    //eller
    setcookie('gave', 'ja', time()+3600, "/");
}
else
{
  $_SESSION['gave'] = 'nej';
  //eller
    $_COOKIE['gave'] = 'nej';
    setcookie('gave', 'nej', time()+3600, "/");
}
?>