Forms and the method post

Hi!

I have two php pages on php for windows, and I want to post a variable from the page choose.php to choose2.php

I have the form in choose.php:

<form name="choosedate"  action="choose2.php" method="post">
      <select name="fday">
      <option value="01">01  
      <option value="02">02      

</select>
<input type="submit" name="Submit" value="Submit">
</form>

and in choose2.php
i try to write:

<?php

echo "$fday";
?>

But i get the error:
Notice: Undefined variable: fday in E:\Inetpub\wwwroot\tev2\choose2.php on line 3


Can anyone tell me what to do or explain why this happens?

Thanks in advance!

Best regards,
Tom-Erik