Since your host doesn't have rewrite module, you may use the following thing:
delete the "articles" directory.
make a new php file named "articles" (without any extension) and place it at same place where you will place the articles directory.
Now:
$vars=explode("/",$_SERVER["QUERY_STRING"]);
$vars is an array.
$vars[0], $vars[1],... will contain the data.
$vars[0] is the id
$vars[1] is the page number
now $id=$vars[0]
$page=$vars[1]
now do whatever you did in page.php
before you try to see the output we must tell apache that it is a PHP file not a text file so use the following text and paste it in your .htaccess file
<Files articles>
ForceType application/x-httpd-php
</Files>