diff --git a/Makefile b/Makefile
index 8089e761..de747cb9 100644
--- a/Makefile
+++ b/Makefile
@@ -15,7 +15,7 @@ ZIP = zip
 # find the vimperator chrome dir
 
 FIREFOX_DEFAULT = $(wildcard ${HOME}/.mozilla/firefox/*.default)
-VIMPERATOR_CHROME = $(wildcard ${FIREFOX_DEFAULT}/extensions/vimperator@mozdev.org/chrome/)
+VIMPERATOR_CHROME = ${FIREFOX_DEFAULT}/extensions/vimperator@mozdev.org/chrome/
 
 # specify V=1 on make line to see more verbose output
 Q=$(if ${V},,@)
@@ -48,6 +48,8 @@ info:
 	@echo    "vimperator chrome   ${VIMPERATOR_CHROME}"
 
 needs_chrome_dir:
+	@echo "Checking chrome dir..."
+	-${Q}mkdir -p "${VIMPERATOR_CHROME}"
 	${Q}test -d "${VIMPERATOR_CHROME}"
 
 xpi: ${RELEASE}
diff --git a/TODO b/TODO
index f0fc8133..bc2543dd 100644
--- a/TODO
+++ b/TODO
@@ -31,6 +31,7 @@ FEATURES:
 6 autocommands (BrowserStart, BrowserQuit, TabClose, TabOpen, TabChanged, PageLoaded, any more?)
 6 vim like mappings for caret mode and textboxes (i to start caret mode?)
 6 pipe selected text/link/website to an external command
+6 it would be nice to have :undo <url> w/ tab completion support
 6 macros (qq)
 6 support firefox search engines, or at least make our search enginges user configurable
 6 gf = view source?
diff --git a/vimperatorrc.example b/vimperatorrc.example
index 10fe3f62..4e880f51 100644
--- a/vimperatorrc.example
+++ b/vimperatorrc.example
@@ -9,4 +9,68 @@ hello = function(name)
 {
 	alert("Hello world: " + name);
 }
+
+//Checks if a mapping is already defined and returnes the index in g_mappings,
+//where it is defined, or -1
+find_map = function(tofind)
+{
+        for (var i in g_mappings)
+        {
+                // each internal mapping can have multiple keys
+                for (var j in g_mappings[i][0])
+                {
+                        var mapping = g_mappings[i][0][j];
+                        if(mapping == tofind) {
+                                //alert("Mapping '"+tofind+"' found");
+                                return i;
+                        }
+                }
+        }
+//      alert("Mapping '"+tofind+"' not found");
+        return -1;
+}
+
+//(re)define a mapping map, with usage, helptext by function func
+//see examples below
+//Current problem: Doesn't remove helptext, when a mapping is unassigned
+define_map = function(map, usage, helptext, func) {
+        //check if mapping exists:
+        var i=find_map(map);
+        var newmap = [[map],[usage],helptext,func];
+        if(i>=0)
+        {
+                //unassign map
+                var changed_maps=new Array();
+                for(j in g_mappings[i][0]) {
+                        if(g_mappings[i][0][j]!=map)
+                                changed_maps.push(g_mappings[i][0][j]);
+                }
+                g_mappings[i][0]=changed_maps;
+        }
+        //add new map
+        g_mappings.push(newmap);
+        alert("Mapping '"+map+"' added.");
+}
+print_maps = function (toPrint) {
+var doc = gBrowser.contentDocument;
+doc.open();
+var text="";
+for( i in g_mappings) {
+        var curmaps = "";
+        for (j in g_mappings[i][0])
+                curmaps += g_mappings[i][0][j].replace("<","&le;").replace(">","&ge")+", ";
+        text +="<br><br>["+curmaps+"]";
+}
+doc.write(text);
+
+doc.close();
+}
+
 EOF
+
+
+" use functions to define maps for h and l
+javascript define_map("h","h","previous tab",function(){tab_go(-1);});
+javascript define_map("l","l","next tab",function(){tab_go(0);});
+
+" vim: set syntax=javascript :