I am having trouble passing hidden variables when I use the header function. The hidden variable appears in the URL, even when I have declared it as hidden.

For example:

File1.php
<HTML>
<HEAD>
<TITLE>Setting Prefs</TITLE>
</HEAD>

<?	
$test_variable="TestingHiddenVariable";
?>

<FORM METHOD="POST" ACTION="File2.php?">
<input type="hidden" name="test_variable" value="<?echo $test_variable ?>"> 

</FORM>
</BODY>
</HTML>

File2.php
<?
$new_test_variable = "DidItWork";
$test_variable = $new_test_variable;
Header("Location: File3.php?test_variable=$test_variable");
?>

File3.php
<HTML>
<HEAD>
<TITLE>Setting Prefs</TITLE>
</HEAD>

<FORM METHOD="POST" ACTION="File4.php">
<input type="hidden" name="test_variable" value="<?echo $test_variable ?>"> 

</FORM>
</BODY>
</HTML>

After the header function calls File3.php. The url has ...File3.php?test_variable=DidItWork

If anyone have a clue how to pass hidden variables using the header function please let me know. Your help will be greatly appreciated.

Thanks