php linking

[invitezone]

Hi there,
I have a simple php login script but need to change something slightly

$msg		= 'Password incorrect.';



<form action="" method="POST">
			<p>
			  <input type="password" name="password" size="20">
			  &nbsp;
			  <input type="submit" value="Login">
			  <input type="hidden" name="sub" value="sub">
	</p>
  <div class=error><?=$msg?></div>

instead of displaying the password incorrect message i would like to send the user to a url with their whatever they put as the password on the end

eg. www.mysite.com/1.php?substring=XXXX

where XXXX is their input


could some explain how I could do that please

thanks a lot