move help to backend class

classes/backend.php

@@ -6,5 +6,23 @@ class Backend extends Handler {
 		print __("Loading, please wait...") . " " .
 			"<img src='images/indicator_tiny.gif'>";
 	}
+
+	function digestSend() {
+		send_headlines_digests($this->link);
+	}
+
+	function help() {
+		$tid = (int) $_REQUEST["tid"];
+
+		if (file_exists("help/$tid.php")) {
+			include("help/$tid.php");
+		} else {
+			print "<p>".__("Help topic not found.")."</p>";
+		}
+		print "<div align='center'>
+			<button onclick=\"javascript:window.close()\">".
+			__('Close this window')."</button></div>";
+
+	}
 }
 ?>