--- a/include/common-session.inc.php
+++ b/include/common-session.inc.php
@@ -1,1 +1,57 @@
+<?php
+// you have to open the session to be able to modify or remove it
+session_start();
+if (isset($_REQUEST['service_period'])) {
+	$_SESSION['service_period'] = filter_var($_REQUEST['service_period'], FILTER_SANITIZE_STRING);
+	sessionUpdated();
+}
+if (isset($_REQUEST['time'])) {
+	$_SESSION['time'] = filter_var($_REQUEST['time'], FILTER_SANITIZE_STRING);
+	sessionUpdated();
+}
+if (isset($_REQUEST['geolocate'])) {
+	$geocoded = false;
+	if (isset($_REQUEST['lat']) && isset($_REQUEST['lon'])) {
+		$_SESSION['lat'] = trim(filter_var($_REQUEST['lat'], FILTER_SANITIZE_NUMBER_FLOAT, FILTER_FLAG_ALLOW_FRACTION));
+		$_SESSION['lon'] = trim(filter_var($_REQUEST['lon'], FILTER_SANITIZE_NUMBER_FLOAT, FILTER_FLAG_ALLOW_FRACTION));
+	}
+	else {
+		$geolocate = filter_var($_REQUEST['geolocate'], FILTER_SANITIZE_URL);
+		echo $_REQUEST['geolocate'];
+		if (startsWith($geolocate, "-")) {
+			$locateparts = explode(",", $geolocate);
+			$_SESSION['lat'] = $locateparts[0];
+			$_SESSION['lon'] = $locateparts[1];
+		}
+		else {
+			$contents = geocode($geolocate, true);
+			print_r($contents);
+			if (isset($contents[0]->centroid)) {
+				$geocoded = true;
+				$_SESSION['lat'] = $contents[0]->centroid->coordinates[0];
+				$_SESSION['lon'] = $contents[0]->centroid->coordinates[1];
+			}
+			else {
+				$_SESSION['lat'] = "";
+				$_SESSION['lon'] = "";
+			}
+		}
+	}
+	if ($_SESSION['lat'] != "" && isAnalyticsOn()) {
+		trackEvent("Geolocation","Updated Location", "Geocoded - ".($geocoded ? "Yes" : "No"));
+	}
+	sessionUpdated();
+}
+function sessionUpdated() {
+	$_SESSION['lastUpdated'] = time();
+}
+// timeoutSession
+$TIMEOUT_LIMIT = 60*5; // 5 minutes
+if (isset($_SESSION['lastUpdated']) && $_SESSION['lastUpdated']+$TIMEOUT_LIMIT < time()) {
+	debug ("Session timeout ".($_SESSION['lastUpdated']+$TIMEOUT_LIMIT).">".time(),"session");
+	session_destroy();
+	session_start();
+}
+debug(print_r($_SESSION, true) , "session");
 
+?>