diff --git a/calendar/js/calendar.js b/calendar/js/calendar.js
index 887712e..30ca7dc 100644
--- a/calendar/js/calendar.js
+++ b/calendar/js/calendar.js
@@ -2,13 +2,14 @@ var username = "root";
 var appointments;
 var categories;
 var filter = 0;
+var host = "://dhbw.t-battermann.de/calendar/rewrite.php";
 
 function getListItems() {
 	var request = new XMLHttpRequest();
 	request.onreadystatechange = function() {
 		getListItemOnReadyStatusChangeEventHandler( request, filter );
 	};
-	request.open("GET", "http://host.bisswanger.com/dhbw/calendar.php?user="+username+"&format=json&action=list");
+	request.open("GET", host + "?user="+username+"&format=json&action=list");
 	request.send();
 }
 function showCategory( id ) {
@@ -17,7 +18,7 @@ function showCategory( id ) {
 	request.onreadystatechange = function() {
 		getListItemOnReadyStatusChangeEventHandler( request, id );
 	};
-	request.open("GET", "http://host.bisswanger.com/dhbw/calendar.php?user="+username+"&format=json&action=list");
+	request.open("GET", host + "?user="+username+"&format=json&action=list");
 	request.send();
 }
 function prettyDate(from, to, allday) {
@@ -239,7 +240,7 @@ function createNewCategory() {
 	request.onreadystatechange = function() {
 	   createNewCategoryOnReadyStatusChangeEventHandler( request );
 	};
-	request.open("POST", "http://host.bisswanger.com/dhbw/calendar.php?user="+username+"&format=json&action=add-category&name="+name);
+	request.open("POST", host + "?user="+username+"&format=json&action=add-category&name="+name);
 	request.setRequestHeader("Content-type", "application/x-www-form-urlencoded");
 	request.send("name="+encodeURIComponent(name));
 }
@@ -258,7 +259,7 @@ function getCategories() {
 	request.onreadystatechange = function() {
 		getCategoriesOnReadyStatusChangeEventHandler( request );
 	};
-	request.open("GET", "http://host.bisswanger.com/dhbw/calendar.php?user="+username+"&format=json&action=list-categories");
+	request.open("GET", host + "?user="+username+"&format=json&action=list-categories");
 	request.send();
 }
 function getCategoriesOnReadyStatusChangeEventHandler( request ) {
@@ -294,7 +295,7 @@ function deleteCategory( id ) {
 	request.onreadystatechange = function() {
 		deleteCategoryOnReadyStatusChangeEventHandler( request );
 	};
-	request.open("GET", "http://host.bisswanger.com/dhbw/calendar.php?user="+username+"&format=json&action=delete-category&id=" + encodeURIComponent(id) );
+	request.open("GET", host + "?user="+username+"&format=json&action=delete-category&id=" + encodeURIComponent(id) );
 	request.send();
 }
 function deleteCategoryOnReadyStatusChangeEventHandler( request ) {
@@ -327,7 +328,7 @@ function createNewEntry() {
 	request.onreadystatechange = function() {
 		createNewEntryOnReadyStatusChangeEventHandler( request );
 	};
-	request.open("POST", "http://host.bisswanger.com/dhbw/calendar.php?user="+username+"&format=json&action=add" );
+	request.open("POST", host + "?user="+username+"&format=json&action=add" );
 	request.setRequestHeader("Content-type", "application/x-www-form-urlencoded");
 	var allday = f["allday"].checked;
 	request.send(
@@ -395,7 +396,7 @@ function updateAppointment( id ) {
 	request.onreadystatechange = function() {
 		updateAppointmentOnReadyStatusChangeEventHandler( request );
 	};
-	request.open("POST", "http://host.bisswanger.com/dhbw/calendar.php?user="+username+"&format=json&action=update" );
+	request.open("POST", host + "?user="+username+"&format=json&action=update" );
 	request.setRequestHeader("Content-type", "application/x-www-form-urlencoded");
 	var allday = f["allday"].checked;
 	request.send(
@@ -427,7 +428,7 @@ function deleteAppointment( id ) {
 		request.onreadystatechange = function() {
 			deleteAppointmentOnReadyStatusChangeEventHandler( request );
 		};
-		request.open("GET", "http://host.bisswanger.com/dhbw/calendar.php?user="+username+"&format=json&action=delete&id=" + encodeURIComponent(id) );
+		request.open("GET", host + "?user="+username+"&format=json&action=delete&id=" + encodeURIComponent(id) );
 		request.send();
 	}
 }
@@ -479,7 +480,7 @@ function uploadImage( id ) {
 	request.onreadystatechange = function() {
 		uploadImageOnReadyStatusChangeEventHandler( request );
 	};
-	request.open("POST", "http://host.bisswanger.com/dhbw/calendar.php?user="+username+"&format=json&action=upload-image&id=" + id );
+	request.open("POST", host + "?user="+username+"&format=json&action=upload-image&id=" + id );
 	//request.setRequestHeader("Content-type", "application/x-www-form-urlencoded");
 	var formData = new FormData();
 	formData.append("file", f["image"].files[0]);
@@ -503,7 +504,7 @@ function deleteImage( id ) {
 			request.onreadystatechange = function() {
 				deleteImageOnReadyStatusChangeEventHandler( request, id );
 			};
-			request.open("GET", "http://host.bisswanger.com/dhbw/calendar.php?user="+username+"&format=json&action=delete-image&id=" + encodeURIComponent(id) );
+			request.open("GET", host + "?user="+username+"&format=json&action=delete-image&id=" + encodeURIComponent(id) );
 			request.send();
 		}
 	}
@@ -559,7 +560,7 @@ function addCategory( id ) {
 	request.onreadystatechange = function() {
 		addCategoryOnReadyStatusChangeEventHandler( request, id );
 	};
-	request.open("GET", "http://host.bisswanger.com/dhbw/calendar.php?user="+username+"&format=json&action=put-category&event=" + id + "&category=" + f["category"].value );
+	request.open("GET", host + "?user="+username+"&format=json&action=put-category&event=" + id + "&category=" + f["category"].value );
 	request.send();
 }
 function addCategoryOnReadyStatusChangeEventHandler( request, id ) {
@@ -579,7 +580,7 @@ function deleteCategoryFromEvent( eventId, categoryId ) {
 	request.onreadystatechange = function() {
 		deleteCategoryFromEventOnReadyStatusChangeEventHandler( request, eventId, categoryId );
 	};
-	request.open("GET", "http://host.bisswanger.com/dhbw/calendar.php?user="+username+"&format=json&action=remove-category&event=" + eventId + "&category=" + categoryId );
+	request.open("GET", host + "?user="+username+"&format=json&action=remove-category&event=" + eventId + "&category=" + categoryId );
 	request.send();
 }
 function deleteCategoryFromEventOnReadyStatusChangeEventHandler( request, eventId, categoryId ) {
diff --git a/calendar/redirect.php b/calendar/redirect.php
new file mode 100644
index 0000000..2f7b7b2
--- /dev/null
+++ b/calendar/redirect.php
@@ -0,0 +1,80 @@
+<?php
+/**
+This script redirects all calls to the real Web Service.
+This is required to allow AJAX calls as cross-domain requests are normally not allowed.
+*/
+
+// URL of the target script
+$url = "http://host.bisswanger.com/dhbw/calendar.php";
+
+// Attach GET fields to URL
+$get = "";
+
+foreach ($_GET as $key => $value)
+{
+    $key = htmlspecialchars($key);
+    $value = htmlspecialchars($value);
+    if ($get != "")
+    {
+        $get .= "&";
+    }
+    $get .= "$key=$value";
+}
+
+if ($get != "")
+{
+    $url .= "?" . $get;
+}
+
+// Handle POST fields
+$post = array();
+
+foreach ($_POST as $key => $value)
+{
+    $key = htmlspecialchars($key);
+    $value = htmlspecialchars($value);
+
+    $post[$key] = $value;
+}
+
+// Handle FILE attachments
+$header = "";
+
+foreach ($_FILES as $key => $value)
+{
+    $header = array('Content-Type: multipart/form-data');
+    $post[htmlspecialchars($key)] = '@' . $value['tmp_name'] . ';type=' . $value['type'] . ';filename=' . $value['name'];
+}
+
+// Init cURL
+$ch = curl_init();
+curl_setopt($ch, CURLOPT_URL, $url);
+curl_setopt($ch, CURLOPT_RETURNTRANSFER, TRUE);
+curl_setopt($ch, CURLOPT_HEADER, FALSE);
+curl_setopt ($ch, CURLOPT_CONNECTTIMEOUT, 20);
+curl_setopt ($ch, CURLOPT_USERAGENT, $_SERVER['HTTP_USER_AGENT']);
+
+if (count($post) > 0)
+{
+    curl_setopt($ch, CURLOPT_POST, TRUE);
+    curl_setopt($ch, CURLOPT_POSTFIELDS, $post);
+}
+
+if ($header != "")
+{
+    curl_setopt($ch, CURLOPT_HTTPHEADER, $header);
+}
+
+// Execute request
+$result = curl_exec($ch);
+
+// Redirect content type
+$contentType = curl_getinfo($ch, CURLINFO_CONTENT_TYPE);
+header("Content-Type: " . $contentType);
+
+// Close connection
+curl_close($ch);
+
+// return web service result
+print $result;
+?>