htacess with variables

Hello, I'm trying to use htacess with varis, but I'm not succeeding.

My htacess is so

RewriteEngine On 

RewriteRule ^$ /site/
RewriteRule ^index$ /site/index.php
RewriteRule ^continue/([a-zA-Z0-9]+)/$ /site/continue.php?id=$1 [QSA]

But continue does not work, from 404.

and to redirect to this page is like this

header("Location: ../continue/".$id);