Please help me to store values from CheckBox and Select elements to Session variable. following is the code.

PHP Code:
<?php

// check1.php

session_start();
if(isset($_POST["major"], $_POST["minor"], $_POST["card"]))
{
      $_SESSION["card"]=$_POST["card"];
      $_SESSION["major"]=$_POST["major"];
      $_SESSION["minor"]=$_POST["minor"];
}

?>
HTML Code:
<html>
<head>
<head>
<title>Check Box</title>
</head>
<body>
<form name="f" method="POST" action="<?php echo $_SERVER["PHP_SELF"]; ?>">
<select size="3" name="card">
<option name="card">One Card</option>
<option name="card">Two Cards</option>
<option name="card">Three Cards</option>
</select>
<br><br>
&nbsp;<input type="checkbox" name="major" value="Major">Major
&nbsp;<input type="checkbox" name="minor" value="Minor">Minor
<br><br>
<input type="button" name="b" value="Click" onclick="Redirect()">
</form>
</body>

<script language="javascript">

function Redirect()
{
      location.href="check2.php";
}

</script>

</html>


PHP Code:
<?php

// check2.php

session_start();
echo $_SESSION["card"]."<br>";
echo $_SESSION["major"]."<br>";
echo $_SESSION["minor"]."<br>";

?>