diff --git a/src/www/js/grammar_manager.js b/src/www/js/grammar_manager.js
index a2bf3b830..11d13d71c 100644
--- a/src/www/js/grammar_manager.js
+++ b/src/www/js/grammar_manager.js
@@ -20,7 +20,7 @@ function GrammarManager(server,opts) {
     this.options = {
         initial: {}
     };
-    this.hooks = {
+    this.actions = {
         onload: [
             function(gm){ debug("default action: onload"); }
         ],
@@ -36,13 +36,13 @@ function GrammarManager(server,opts) {
     }
 
     // Apply supplied options
-//    if(opts) for(var o in opts) this.options[o]=opts[o];
+    if(opts) for(var o in opts) this.options[o]=opts[o];
 
     /* --- Client state initialisation -------------------------------------- */
     this.server = server;
     this.grammar = null; // current grammar
-    // this.grammars=[];
-    // this.grammar_dirs=[];
+    this.grammars=[];
+    this.grammar_dirs=[];
     this.startcat = null; // current startcat
     this.languages = []; // current languages (empty means all langs)
 
@@ -71,17 +71,23 @@ GrammarManager.prototype.onload=function(dir,grammar_names,dir_count) {
 /* --- Registering / unregistering actions to hooks ------------------------- */
 
 GrammarManager.prototype.register_action=function(hook,action) {
-    this.hooks[hook].push(action);
+    var hookring = this.actions[hook];
+    hookring.push(action);
 }
 
 GrammarManager.prototype.unregister_action=function(hook,action) {
-    // TODO!
+    var hookring = this.actions[hook];
+    for (var f=0; f < hookring.length; f++) {
+        if (hookring[f] == action) {
+            hookring = Array.remove(hookring, f);
+        }
+    }
 }
 
 // Execute actions for a given hook
 // TODO: any number of arguments
 GrammarManager.prototype.run_actions=function(hook,arg1,arg2,arg3) {
-    var acts = this.hooks[hook];
+    var acts = this.actions[hook];
     for (f in acts) {
         acts[f](arg1,arg2,arg3);
     }
@@ -147,11 +153,11 @@ GrammarManager.prototype.update_language_list=function(grammar) {
     // Replace the options in the menu with the languages in the grammar
     var langs=grammar.languages;
     for(var i=0; i<langs.length; i++) {
-	var ln=langs[i].name;
+	var ln=langs[i].name; // "PhrasebookEng"
 	if(!hasPrefix(ln,"Disamb")) {
-	    var lp=langpart(ln,grammar.name);
+	    var lp=langpart(ln,grammar.name); // "Eng"
             if (elem(lp, t.options.initial.languages)) {
-                t.languages.push(ln); // or lp?
+                t.languages.push(ln);
             }
 	}
     }
diff --git a/src/www/js/support.js b/src/www/js/support.js
index eefda3f8b..47753e768 100644
--- a/src/www/js/support.js
+++ b/src/www/js/support.js
@@ -22,12 +22,21 @@ if(!Array.isArray) {
 
 // Create a clone of an array
 // http://davidwalsh.name/javascript-clone-array
-// Note that iterating over an array with for...in will include "clone" as a key!
-// if(!Array.clone) {
-//     Array.prototype.clone = function() {
-//         return this.slice(0);
-//     };
-// }
+if(!Array.clone) {
+    Array.clone = function(arg) {
+        return arg.slice(0);
+    };
+}
+
+// Array Remove - By John Resig (MIT Licensed)
+// http://ejohn.org/blog/javascript-array-remove/if(!Array.remove) {
+if(!Array.remove) {
+    Array.remove = function(arg, from, to) {
+        var rest = arg.slice((to || from) + 1 || arg.length);
+        arg.length = from < 0 ? arg.length + from : from;
+        return arg.push.apply(arg, rest);
+    };
+}
 
 /* --- JSONP ---------------------------------------------------------------- */
 
diff --git a/src/www/syntax-editor/README.md b/src/www/syntax-editor/README.md
index 62c7e32cd..8857bc46a 100644
--- a/src/www/syntax-editor/README.md
+++ b/src/www/syntax-editor/README.md
@@ -13,21 +13,21 @@ An improved version of the [old syntax editor][1].
 
 ## Available startup options
 
-    var editor_options = {
-        target: "editor",
-            initial: {
-                grammar: "http://localhost:41296/grammars/Foods.pgf",
-                startcat: "Kind",
-                languages: ["Eng","Swe","Mlt"],
-                abstr: "Pred (That Fish) Expensive"
-            },
-            show: {
-                grammar_menu: true,
-                startcat_menu: true,
-                to_menu: true,
-                random_button: true
-            }
-        }
+|Options|Description|Default|
+|:------|:----------|:------|
+|target |           |"editor"|
+|initial.grammar|Initial grammar URL, e.g. `"http://localhost:41296/grammars/Foods.pgf"`|-|
+|initial.startcat|Initial startcat|-|
+|initial.languages|Initial linearisation languages, e.g. `["Eng","Swe","Mlt"]`|-|
+|initial.abstr|Initial abstract tree (as string), e.g. `"Pred (That Fish) Expensive"`|-|
+|show.grammar_menu|Show grammar menu?|true|
+|show.startcat_menu|Show start category menu?|true|
+|show.to_menu|Show languages menu?|true|
+|show.random_button|Show random button?|true|
+
+## Example usage
+
+See `editor.html` and `editor_online.js`.
 
 ## TODO
 
diff --git a/src/www/syntax-editor/ast.js b/src/www/syntax-editor/ast.js
index 143b9836c..2cad53600 100644
--- a/src/www/syntax-editor/ast.js
+++ b/src/www/syntax-editor/ast.js
@@ -8,7 +8,7 @@ function NodeID(x) {
         switch (typeof x) {
         case "number": this.id = [x]; break;
         case "string": this.id = map(function(s){return parseInt(s)}, x.split(",")); break;
-        case "object": this.id = x.get().slice(); break; // another NodeID
+        case "object": this.id = Array.clone(x.get()); break; // another NodeID
         }
     }
 
@@ -101,7 +101,7 @@ function AST(fun, cat) {
     
     // set tree at given id
     this._setSubtree = function(id, subtree) {
-        var lid = id.get().slice(); // clone NodeID array
+        var lid = Array.clone(id.get()); // clone NodeID array
         var node = this.root;
 
         if (lid.length==1)
@@ -124,7 +124,7 @@ function AST(fun, cat) {
         switch (typeof id) {
         case "number": lid = [id]; break;
         case "string": lid = id.split(","); break;
-        case "object": lid = id.get().slice(); break; // clone NodeID array
+        case "object": lid = Array.clone(id.get()); break; // clone NodeID array
         }
         var node = this.root;
         if (lid[0] == 0) lid.shift();
diff --git a/src/www/syntax-editor/editor.html b/src/www/syntax-editor/editor.html
index 403b4bbeb..8105df60d 100644
--- a/src/www/syntax-editor/editor.html
+++ b/src/www/syntax-editor/editor.html
@@ -11,7 +11,7 @@
   <h2>Syntax Editor</h2>
   <div id="minibar"></div>
   <div id="editor"></div>
-  <noscript>This page doesn't works unless JavaScript is enabled.</noscript>
+  <noscript>This page doesn't work unless JavaScript is enabled.</noscript>
 
   <hr />
   <small class="modtime">
diff --git a/src/www/syntax-editor/editor.js b/src/www/syntax-editor/editor.js
index 031a461a2..41360c53f 100644
--- a/src/www/syntax-editor/editor.js
+++ b/src/www/syntax-editor/editor.js
@@ -1,20 +1,4 @@
 /* --- Main Editor object --------------------------------------------------- */
-/* When creating the object, stuff gets called in this order:
-new EditorMenu
-  server.get_grammarlists
-  EditorMenu.show_grammarlist
-    EditorMenu.change_grammar
-      server.switch_to_other_grammar
-      server.get_grammar_info
-      EditorMenu.update_startcat_menu
-      EditorMenu.update_language_menu
-      Editor.change_grammar
-        Editor.get_grammar_constructors
-        Editor.start_fresh
-          Editor.update_current_node();
-            Editor.redraw_tree();
-            Editor.get_refinements();
-*/
 function Editor(gm,opts) {
     var t = this;
     /* --- Configuration ---------------------------------------------------- */
@@ -64,11 +48,6 @@ function Editor(gm,opts) {
     /* --- Register Grammar Manager hooks ----------------------------------- */
     this.gm.register_action("change_grammar",function(grammar){
         debug("Editor: change grammar");
-        var startcat0 = t.options.initial.startcat;
-        if (elem(startcat0, grammar.categories))
-            t.startcat = startcat0;
-        else
-            t.startcat = null;
         t.get_grammar_constructors(bind(t.start_fresh,t));
     });
     this.gm.register_action("change_startcat",function(startcat){
@@ -124,19 +103,19 @@ Editor.prototype.get_startcat=function() {
 }
 
 // TODO
-Editor.prototype.initialize_from=function(opts) {
-    var t=this;
-    if (opts.startcat)
-        t.options.initial_startcat=opts.startcat;
-    t.change_grammar();
-    if (opts.abstr)
-        t.import_ast(opts.abstr);
-}
+// Editor.prototype.initialize_from=function(opts) {
+//     var t=this;
+//     if (opts.startcat)
+//         t.options.initial_startcat=opts.startcat;
+//     t.change_grammar();
+//     if (opts.abstr)
+//         t.import_ast(opts.abstr);
+// }
 
 // Called after changing grammar or startcat
 Editor.prototype.start_fresh=function () {
     var t = this;
-        t.ast = new AST(null, t.get_startcat());
+    t.ast = new AST(null, t.get_startcat());
     if (t.options.initial.abstr) {
         t.import_ast(t.options.initial.abstr);
     }
diff --git a/src/www/syntax-editor/editor_menu.js b/src/www/syntax-editor/editor_menu.js
index e207133e7..31927a26e 100644
--- a/src/www/syntax-editor/editor_menu.js
+++ b/src/www/syntax-editor/editor_menu.js
@@ -107,7 +107,7 @@ EditorMenu.prototype.hook_onload=function(dir,grammar_names,dir_count) {
     appendChildren(t.ui.grammar_menu, map(opt, grammar_names));
     function pick_first_grammar() {
 	if(t.timeout) clearTimeout(t.timeout),t.timeout=null;
-	var grammar0=t.options.initial.grammar;
+	var grammar0=t.gm.options.initial.grammar;
 	if(!grammar0) grammar0=t.grammars[0];
 	t.ui.grammar_menu.value=grammar0;
 //	t.change_grammar();
@@ -139,16 +139,11 @@ EditorMenu.prototype.update_startcat_menu=function(grammar) {
     menu.innerHTML="";
     var cats=grammar.categories;
     for(var cat in cats) menu.appendChild(option(cats[cat],cats[cat]))
-//    var startcat=this.local.get("startcat") || grammar.startcat;
-    var startcat0 = t.options.initial.startcat;
+    var startcat0 = t.gm.options.initial.startcat;
     if (elem(startcat0, cats))
         menu.value = startcat0;
     else
         menu.value = grammar.startcat;
-    // else {
-    //     insertFirst(menu,option("Default",""));
-    //     menu.value="";
-    // }
 }
 
 /* --- Langugage (to) menu -------------------------------------------------- */
@@ -168,9 +163,8 @@ EditorMenu.prototype.update_language_menu=function(menu,grammar) {
 	if(!hasPrefix(ln,"Disamb")) {
 	    var lp=langpart(ln,grammar.name);
             var opt=option(lp,ln);
-            if (elem(lp, t.options.initial.languages)) {
+            if (elem(lp, t.gm.options.initial.languages)) {
                 opt.selected=true;
-                t.editor.languages.push(opt.value);
             }
 	    menu.appendChild(opt);
 	}
diff --git a/src/www/syntax-editor/editor_online.js b/src/www/syntax-editor/editor_online.js
index 5ca81c9fa..56e8a9de3 100644
--- a/src/www/syntax-editor/editor_online.js
+++ b/src/www/syntax-editor/editor_online.js
@@ -4,12 +4,9 @@ var server_options = {
 }
 var editor_options = {
     target: "editor",
-    // initial: {
-    //     grammar: "http://localhost:41296/grammars/Phrasebook.pgf",
-    //     startcat: "Proposition",
-    //     languages: ["Eng","Swe","Ita"],
-    //     abstr: "PropOpenDate (SuperlPlace TheMostExpensive School) Tomorrow"
-    // },
+    initial: {
+//        abstr: "PropOpenDate (SuperlPlace TheMostExpensive School) Tomorrow"
+    },
     show: {
         grammar_menu: true,
         startcat_menu: true,