diff --git a/src/eu/simstadt/regionchooser/RegionChooserFX.java b/src/eu/simstadt/regionchooser/RegionChooserFX.java
index fd8e2a72adbb7333dcab52359500834da44c375e..4400d49f623b7e65d1310207e2d10aaaf6807957 100644
--- a/src/eu/simstadt/regionchooser/RegionChooserFX.java
+++ b/src/eu/simstadt/regionchooser/RegionChooserFX.java
@@ -1,5 +1,7 @@
 package eu.simstadt.regionchooser;
 
+import java.nio.file.Files;
+import java.nio.file.Path;
 import java.nio.file.Paths;
 import javafx.application.Application;
 import javafx.beans.value.ObservableValue;
@@ -36,8 +38,14 @@ public static void main(String[] args) {
 class Browser extends Region
 {
 
-	public class JavaApp
+	public class JavaScriptFXBridge
 	{
+		private Path repo;
+
+		public JavaScriptFXBridge() {
+			repo = Paths.get("../TestRepository");
+		}
+
 		public void downloadRegion(String wktPolygon) {
 			System.out.println("FROM JAVA : DO SOMETHING with " + wktPolygon);
 		}
@@ -47,8 +55,14 @@ public void downloadRegionFromCityGML(String wktPolygon, String citygmlDescripti
 		}
 
 		public boolean checkIfCityGMLSAreAvailable(String citygmlDescription) {
-			//TODO: IMPLEMENT ME
-			return true;
+			boolean available = false;
+			String[] projectAndCityGML = citygmlDescription.split(">");
+			if (projectAndCityGML.length == 2) {
+				String project = projectAndCityGML[0];
+				String citygml = projectAndCityGML[1];
+				available = Files.isReadable(repo.resolve(project + ".simstadt").resolve(citygml));
+			}
+			return available;
 		}
 	}
 
@@ -59,15 +73,14 @@ public Browser() {
 		//apply the styles
 		getStyleClass().add("browser");
 		// load the web page
-		String url = "file://" + Paths.get("../RegionChooser/website/index.html").toAbsolutePath().toString();
+		String url = Paths.get("../RegionChooser/website/index.html").toUri().toString();
 		webEngine.load(url);
 		// process page loading
 		webEngine.getLoadWorker().stateProperty().addListener(
-				(ObservableValue<? extends State> ov, State oldState,
-						State newState) -> {
+				(ObservableValue<? extends State> ov, State oldState, State newState) -> {
 					if (newState == State.SUCCEEDED) {
 						JSObject win = (JSObject) webEngine.executeScript("window");
-						win.setMember("fxapp", new JavaApp());
+						win.setMember("fxapp", new JavaScriptFXBridge());
 					}
 				});
 		//add the web view to the scene