more doesn't work on pages?

Hallo,
I’ve inserted a pages’s content in a template using a very simple loop:
<?php
query_posts(‘page_id=15’);
global $more;
$more = 0;
while (have_posts()) : the_post();
the_content(‘Read the full post ?’);
endwhile;
?>

The content shows but the more tag inserted in the editor doesn’t affect the output.

Any idea?

thx