(har ikek flere point) Session Problem

<form action=\"index.php\" method=\"post\">

<input type=\"text\" value=\"\" name=\"uhy\" id=\"besked\" size=\"22\" style=\"background-color: E9DBE9;  height: 22px; border: 1px solid black;\">
<input type=\"submit\" value=\"Login\" style=\"background-color: E9DBE9;  width: 79px;  height: 22px; border: 1px solid black;\">


</form>

<?php
if($uhy) {
session_start();
session_register(\"uhy\");
header(\"location: login.php\");
}
?>

Hvofor viderstiller det ikke?