-$stylesheets = array(
- "twitter.com" => "twitter_user_timeline2rss.xsl",
-);
-
-if (FALSE === array_key_exists($url["host"], $stylesheets))
- die("Unsupported host\n");
-
-$stylesheet = $stylesheets[$url["host"]];
+$stylesheet = "rss_converter_" . $url["host"] . ".xsl";
+if (FALSE === file_exists($stylesheet))
+ die("Conversion to RSS not supported: {$url["host"]}\n");