Added some 404 handling to lib/exe/detail.php

lib/exe/detail.php

@@ -30,7 +30,8 @@ if($AUTH >= AUTH_READ){
     $SRC = mediaFN($IMG);
     if(!@file_exists($SRC)){
         //doesn't exist!
-
+        header("HTTP/1.0 404 File not Found");
+        $ERROR = 'File not found';
     }
 }else{
     // no auth