diff --git a/scripts/gcf.js b/scripts/gcf.js
index 750df84..56ceb76 100644
--- a/scripts/gcf.js
+++ b/scripts/gcf.js
@@ -29,6 +29,26 @@ var gcf = {
     },
 
 
+    // get the path of the cgi-bin dir with correct http(s) protocol
+    // for using with ajax calls (to with same origin policy)
+    getCgiBinPath : function () {
+
+        // parse actual url and parse for protocol type (http/https)
+        // set the ajax server url dependent on the protocol
+        // for strato ssl-proxy, we have to insert the 1st part of the url path
+        var serverUrl = window.location.protocol + "//" +  window.location.hostname;
+
+        if (serverUrl.indexOf("https") === -1) {
+            serverUrl += "/cgi-bin/";
+        } else {
+            serverUrl += "/" + window.location.pathname.split("/")[1] + "/cgi-bin/";
+        }
+
+        return serverUrl;
+
+    },
+
+
     // xmlhttp object function
     getHTTPObject : function () {
 
@@ -88,4 +108,4 @@ var gcf = {
     }
 
 
-}
\ No newline at end of file
+};
\ No newline at end of file
diff --git a/scripts/haltestellen.js b/scripts/haltestellen.js
index 92e8fd6..76ff614 100644
--- a/scripts/haltestellen.js
+++ b/scripts/haltestellen.js
@@ -9,7 +9,7 @@ var DEBUG;
 
 
     //variable definitions
-    var serverUrl,                                              // this will hold the url we call with the ajaxCall() function
+    var serverUrl = gcf.getCgiBinPath(),                        // the url of the cgi-bin folder with the scripts we call with the ajaxCall() function
         target = document.getElementById("output"),             // get the html area where we print out the data
         searchForm = document.getElementById("search-form"),    // get the search form
         haltestelle;                                            // object with methods to get and process the data
@@ -17,16 +17,6 @@ var DEBUG;
     // debug log
     if (DEBUG === 1) {console.log("anonymous function");}
 
-    // parse actual url and parse for protocol type (http/https)
-    // set the ajax server url dependent on the protocol
-    // for strato ssl-proxy, we have to insert the 1st part of the url path
-    serverUrl = window.location.protocol + "//" +  window.location.hostname;
-
-    if (serverUrl.indexOf("https") === -1) {
-        serverUrl += "/cgi-bin/";
-    } else {
-        serverUrl += "/" + window.location.pathname.split("/")[1] + "/cgi-bin/";
-    }
 
     // haltestelle object
     haltestelle = {
@@ -64,7 +54,7 @@ var DEBUG;
             // process of response only if it's not empty
             if (data.indexOf("[]") !== -1) {  // there was an empty response
 
-                haltestelle.getHaltestellen();
+                this.getHaltestellen();
 
             } else {