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diff --git a/httpexists-proxy.php b/httpexists-proxy.php
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+<?php 
+// Rough proxy to help map.js check for photos.
+// Reason being that requests similar to http://www.tcd.ie/Maps/photos/small/100.jpg
+// were being redirected to http://www.tcd.ie/Maps/photos/small/200.jpg or similar.
+// Because the web server is set up to permenantly redirect 301 to files with a similar name.
+// JavaScript cannot check for redirects (30x) as they are completed before the JavaScript runs.
+// Hence maps.js always got a 200 OK response for redirected photos.
+if (!empty($_GET['httpexistsurl'])) {
+	if (file_exists(dirname($_SERVER['SCRIPT_FILENAME']).'/'.$_GET['httpexistsurl'])) {
+		// all good
+	}
+	else {
+		header("HTTP/1.0 404 Not Found");
+	}
+}
+else {
+	header("HTTP/1.0 404 Not Found");
+}
+
+?>
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