Ето правильно
Код:
if ($num==$_POST['number']){
?>
<form method="POST" action="/cgi-bin/guest_book.cgi">
<input type="hidden" name="n_author" value="n_author">
<input type="hidden" name="telefon" value="telefon">
<input type="hidden" name="n_mail" value="n_mail">
<input type="hidden" name="n_href" value="n_href">
<input type="hidden" name="R1" value="R1">
<input type="hidden" name="mass" value="mass">
<input type="hidden" name="B1" value="B1">
<input type="hidden" name="B3" value="B3">
</form>
<?php }else{ ?>