diff --git a/htroot/yacysearch.html b/htroot/yacysearch.html
index a1f0321c3..3ff57319e 100644
--- a/htroot/yacysearch.html
+++ b/htroot/yacysearch.html
@@ -93,13 +93,9 @@ $(function() {
 	#{/sidebarVocabulary}#
 	$("#sidebarDomains").accordion({});
 	$("#sidebarProtocols").accordion({});
-	$("#sidebarProtocols").accordion('activate', false);
 	$("#sidebarFiletypes").accordion({});
-	$("#sidebarFiletypes").accordion('activate', false);
 	$("#sidebarAuthors").accordion({});
-	$("#sidebarAuthors").accordion('activate', false);
 	$("#sidebarNameSpace").accordion({});
-	$("#sidebarNameSpace").accordion('activate', false);
     $("#sidebarTopics").tagcloud({type:"sphere",power:.25,seed:0,sizemin:10,sizemax:20,height:80,colormin:"682",colormax:"20C"}).find("li").tsort();
     $("#sidebarAbout").accordion({});
 	$("#search").focus();
diff --git a/htroot/yacysearchtrailer.html b/htroot/yacysearchtrailer.html
index 02c0d6a02..89c0b0fa6 100644
--- a/htroot/yacysearchtrailer.html
+++ b/htroot/yacysearchtrailer.html
@@ -24,6 +24,13 @@
 <dd>#[name]# (#[count]#)</dd>
 #{/element}#</dl>
 </div>
+#(activate)#
+<script type="text/javascript">
+//<![CDATA[
+$(function() { $("#sidebarProtocols").accordion('activate', false); });
+//]]>
+</script>
+::#(/activate)#
 #(/nav-protocols)#
 
 #(nav-filetypes)#::
@@ -34,6 +41,13 @@
 <dd>#[name]# (#[count]#)</dd>
 #{/element}#</dl>
 </div>
+#(activate)#
+<script type="text/javascript">
+//<![CDATA[
+$(function() { $("#sidebarFiletypes").accordion('activate', false); });
+//]]>
+</script>
+::#(/activate)#
 #(/nav-filetypes)#
 
 #(nav-domains)#::
@@ -44,6 +58,13 @@
 <dd>#[name]# (#[count]#)</dd>
 #{/element}#</dl>
 </div>
+#(activate)#
+<script type="text/javascript">
+//<![CDATA[
+$(function() { $("#sidebarDomains").accordion('activate', false); });
+//]]>
+</script>
+::#(/activate)#
 #(/nav-domains)#
 
 #(nav-namespace)#::
@@ -54,6 +75,13 @@
 <dd>#[name]# (#[count]#)</dd>
 #{/element}#</dl>
 </div>
+#(activate)#
+<script type="text/javascript">
+//<![CDATA[
+$(function() { $("#sidebarNameSpace").accordion('activate', false); });
+//]]>
+</script>
+::#(/activate)#
 #(/nav-namespace)#
 
 #(nav-authors)#::
@@ -64,6 +92,13 @@
 <dd>#[name]# (#[count]#)</dd>
 #{/element}#</dl>
 </div>
+#(activate)#
+<script type="text/javascript">
+//<![CDATA[
+$(function() { $("#sidebarAuthors").accordion('activate', false); });
+//]]>
+</script>
+::#(/activate)#
 #(/nav-authors)#
 
 #{nav-vocabulary}#
diff --git a/htroot/yacysearchtrailer.java b/htroot/yacysearchtrailer.java
index 51f138c83..661a18ba4 100644
--- a/htroot/yacysearchtrailer.java
+++ b/htroot/yacysearchtrailer.java
@@ -45,6 +45,8 @@ import de.anomic.server.serverSwitch;
 public class yacysearchtrailer {
 
     private static final int MAX_TOPWORDS = 12;
+    private static final int MAXLIMIT_NAV_LOW = 5;
+    private static final int MAXLIMIT_NAV_HIGH = 20;
 
     public static serverObjects respond(final RequestHeader header, final serverObjects post, final serverSwitch env) {
         final serverObjects prop = new serverObjects();
@@ -72,7 +74,7 @@ public class yacysearchtrailer {
         } else {
             prop.put("nav-namespace", 1);
             navigatorIterator = namespaceNavigator.keys(false);
-            int i = 0, p;
+            int i = 0, p, pos = 0, neg = 0;
             String nav, queryStringForUrl;
             while (i < 10 && navigatorIterator.hasNext()) {
                 name = navigatorIterator.next();
@@ -81,11 +83,14 @@ public class yacysearchtrailer {
                 queryStringForUrl = theQuery.queryStringForUrl();
                 p = queryStringForUrl.indexOf(nav);
                 if (p < 0) {
+                    pos++;
                     queryStringForUrl += "+" + nav;
                     prop.put("nav-namespace_element_" + i + "_on", 1);
                     prop.put(fileType, "nav-namespace_element_" + i + "_modifier", nav);
                 } else {
+                    neg++;
                     prop.put("nav-namespace_element_" + i + "_on", 0);
+                    prop.put(fileType, "nav-namespace_element_" + i + "_modifier", "-" + nav);
                     queryStringForUrl = (queryStringForUrl.substring(0, p) + queryStringForUrl.substring(p + nav.length())).trim();
                 }
                 prop.put(fileType, "nav-namespace_element_" + i + "_name", name);
@@ -95,6 +100,7 @@ public class yacysearchtrailer {
                 i++;
             }
             prop.put("nav-namespace_element", i);
+            prop.put("nav-namespace_activate", on(pos, neg, MAXLIMIT_NAV_LOW) ? 1 : 0);
             i--;
             prop.put("nav-namespace_element_" + i + "_nl", 0);
         }
@@ -106,7 +112,7 @@ public class yacysearchtrailer {
         } else {
             prop.put("nav-domains", 1);
             navigatorIterator = hostNavigator.keys(false);
-            int i = 0, p;
+            int i = 0, p, pos = 0, neg = 0;
             String nav, queryStringForUrl;
             while (i < 20 && navigatorIterator.hasNext()) {
                 name = navigatorIterator.next();
@@ -115,10 +121,12 @@ public class yacysearchtrailer {
                 queryStringForUrl = theQuery.queryStringForUrl();
                 p = queryStringForUrl.indexOf(nav);
                 if (p < 0) {
+                    pos++;
                     queryStringForUrl += "+" + nav;
                     prop.put("nav-domains_element_" + i + "_on", 1);
                     prop.put(fileType, "nav-domains_element_" + i + "_modifier", nav);
                 } else {
+                    neg++;
                     queryStringForUrl = (queryStringForUrl.substring(0, p) + queryStringForUrl.substring(p + nav.length())).trim();
                     prop.put("nav-authors_element_" + i + "_on", 0);
                     prop.put(fileType, "nav-authors_element_" + i + "_modifier", "-" + nav);
@@ -130,6 +138,7 @@ public class yacysearchtrailer {
                 i++;
             }
             prop.put("nav-domains_element", i);
+            prop.put("nav-domains_activate", on(pos, neg, MAXLIMIT_NAV_HIGH) ? 1 : 0);
             i--;
             prop.put("nav-domains_element_" + i + "_nl", 0);
         }
@@ -141,7 +150,7 @@ public class yacysearchtrailer {
         } else {
             prop.put("nav-authors", 1);
             navigatorIterator = authorNavigator.keys(false);
-            int i = 0, p;
+            int i = 0, p, pos = 0, neg = 0;
             String nav, queryStringForUrl;
             while (i < 20 && navigatorIterator.hasNext()) {
                 name = navigatorIterator.next().trim();
@@ -150,10 +159,12 @@ public class yacysearchtrailer {
                 queryStringForUrl = theQuery.queryStringForUrl();
                 p = queryStringForUrl.indexOf(nav);
                 if (p < 0) {
+                    pos++;
                     queryStringForUrl += "+" + nav;
                     prop.put("nav-authors_element_" + i + "_on", 1);
                     prop.put(fileType, "nav-authors_element_" + i + "_modifier", nav);
                 } else {
+                    neg++;
                     queryStringForUrl = (queryStringForUrl.substring(0, p) + queryStringForUrl.substring(p + nav.length())).trim();
                     prop.put("nav-authors_element_" + i + "_on", 0);
                     prop.put(fileType, "nav-authors_element_" + i + "_modifier", "-" + nav);
@@ -165,6 +176,7 @@ public class yacysearchtrailer {
                 i++;
             }
             prop.put("nav-authors_element", i);
+            prop.put("nav-authors_activate", on(pos, neg, MAXLIMIT_NAV_LOW) ? 1 : 0);
             i--;
             prop.put("nav-authors_element_" + i + "_nl", 0);
         }
@@ -205,7 +217,7 @@ public class yacysearchtrailer {
         } else {
             prop.put("nav-protocols", 1);
             navigatorIterator = protocolNavigator.keys(false);
-            int i = 0, p;
+            int i = 0, p, pos = 0, neg = 0;
             String nav, queryStringForUrl;
             while (i < 20 && navigatorIterator.hasNext()) {
                 name = navigatorIterator.next().trim();
@@ -214,10 +226,12 @@ public class yacysearchtrailer {
                 queryStringForUrl = theQuery.queryStringForUrl();
                 p = queryStringForUrl.indexOf(nav);
                 if (p < 0) {
+                    pos++;
                     queryStringForUrl += "+" + nav;
                     prop.put("nav-protocols_element_" + i + "_on", 1);
                     prop.put(fileType, "nav-protocols_element_" + i + "_modifier", nav);
                 } else {
+                    neg++;
                     queryStringForUrl = (queryStringForUrl.substring(0, p) + queryStringForUrl.substring(p + nav.length())).trim();
                     prop.put("nav-protocols_element_" + i + "_on", 0);
                     prop.put(fileType, "nav-protocols_element_" + i + "_modifier", "-" + nav);
@@ -229,6 +243,7 @@ public class yacysearchtrailer {
                 i++;
             }
             prop.put("nav-protocols_element", i);
+            prop.put("nav-protocols_activate", on(pos, neg, MAXLIMIT_NAV_LOW) ? 1 : 0);
             i--;
             prop.put("nav-protocols_element_" + i + "_nl", 0);
         }
@@ -240,7 +255,7 @@ public class yacysearchtrailer {
         } else {
             prop.put("nav-filetypes", 1);
             navigatorIterator = filetypeNavigator.keys(false);
-            int i = 0, p;
+            int i = 0, p, pos = 0, neg = 0;
             String nav, queryStringForUrl;
             while (i < 20 && navigatorIterator.hasNext()) {
                 name = navigatorIterator.next().trim();
@@ -249,10 +264,12 @@ public class yacysearchtrailer {
                 queryStringForUrl = theQuery.queryStringForUrl();
                 p = queryStringForUrl.indexOf(nav);
                 if (p < 0) {
+                    pos++;
                     queryStringForUrl += "+" + nav;
                     prop.put("nav-filetypes_element_" + i + "_on", 1);
                     prop.put(fileType, "nav-filetypes_element_" + i + "_modifier", nav);
                 } else {
+                    neg++;
                     queryStringForUrl = (queryStringForUrl.substring(0, p) + queryStringForUrl.substring(p + nav.length())).trim();
                     prop.put("nav-filetypes_element_" + i + "_on", 0);
                     prop.put(fileType, "nav-filetypes_element_" + i + "_modifier", "-" + nav);
@@ -264,6 +281,7 @@ public class yacysearchtrailer {
                 i++;
             }
             prop.put("nav-filetypes_element", i);
+            prop.put("nav-filetypes_activate", on(pos, neg, MAXLIMIT_NAV_LOW) ? 1 : 0);
             i--;
             prop.put("nav-filetypes_element_" + i + "_nl", 0);
         }
@@ -343,4 +361,8 @@ public class yacysearchtrailer {
         return prop;
     }
 
+    private final static boolean on(int pos, int neg, int maxlimit) {
+        return neg > 0 || (pos > 1 && pos <= maxlimit);
+    }
+
 }