Limiting RSS Newsfeed to 10 Items (Headlines)

[Specter]

Code:
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<?PHP
header("Content-type: text/xml");
echo"<?xml version=\"1.0\" encoding=\"windows-1252\" ?>
<rss version=\"0.91\" >
<channel>
<title>Narnia Fans</title>
<link>
http://www.NarniaFans.com</link> <language>en-us</language>
<description>The Latest
News on Narnia and C.S. Lewis</description>
<generator>CuteNews</generator> ";
$template="rss"; include("show_news.php"); echo"</channel></rss>"; ?>
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Feed location: http://www.narniafans.com/news/rss.php

Anyone have any tips on what I can do to limit this to show only the
latest 10 Headlines?