How to preview a page instead of a category?

try and change this line:

query_posts('posts_per_page=1&cat=7');

to:

query_posts('posts_per_page=1&page_id=17');

or:

query_posts('posts_per_page=1&pagename=page-slug');

(enter the actual page ID or page slug into the respective space)

http://codex.wordpress.org/Class_Reference/WP_Query#Post_.26_Page_Parameters

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