Index: /applications/viewer/jmapviewer/src/org/openstreetmap/gui/jmapviewer/tilesources/TemplatedTMSTileSource.java
===================================================================
--- /applications/viewer/jmapviewer/src/org/openstreetmap/gui/jmapviewer/tilesources/TemplatedTMSTileSource.java	(revision 26243)
+++ /applications/viewer/jmapviewer/src/org/openstreetmap/gui/jmapviewer/tilesources/TemplatedTMSTileSource.java	(revision 26244)
@@ -1,6 +1,11 @@
 package org.openstreetmap.gui.jmapviewer.tilesources;
 
+import java.util.Random;
+import java.util.regex.Pattern;
+import java.util.regex.Matcher;
 
 public class TemplatedTMSTileSource extends TMSTileSource {
+    Random rand = null;
+    String[] randomParts = null;
     public TemplatedTMSTileSource(String name, String url, int maxZoom) {
         super(name, url, maxZoom);
@@ -9,14 +14,23 @@
     public TemplatedTMSTileSource(String name, String url, int minZoom, int maxZoom) {
         super(name, url, minZoom, maxZoom);
+        Matcher m = Pattern.compile(".*\\{switch:([^}]+)\\}.*").matcher(url);
+        if(m.matches()) {
+            rand = new Random();
+            randomParts = m.group(1).split(",");
+        }
     }
 
     @Override
     public String getTileUrl(int zoom, int tilex, int tiley) {
-        return this.baseUrl
+        String r = this.baseUrl
         .replaceAll("\\{zoom\\}", Integer.toString(zoom))
         .replaceAll("\\{x\\}", Integer.toString(tilex))
         .replaceAll("\\{y\\}", Integer.toString(tiley))
         .replaceAll("\\{!y\\}", Integer.toString((int)Math.pow(2, zoom)-1-tiley));
-
+        if(r != null) {
+            r = r.replaceAll("\\{switch:[^}]+\\}",
+            randomParts[rand.nextInt(randomParts.length)]);
+        }
+        return r;
     }
 }