see #55: folders manipulation. Work in progress.

This commit adds the following features:
 * Folder creation,
 * Folder modification,
 * Folder removal.

There are still issues with subfolders but they should not be too complicated to fix.

I've also done some javascript refactoring.

static/js/form.js

@@ -1,59 +1,82 @@
-window.addEvent("domready", function() {
-    ajax_submit = function(event, error_callbacks) {
-	var form = event.target;
-	var myid = form.get("id");
+var error_callbacks = {
+    mbaliasform: function() {
+	if ($("id_domain").value == 0) {
+	    $("id_mboxes").set("html", "");
+	}
+	mbaliasform_init();
+    },
+    permform: function() {
+	if ($defined($("id_domain"))) {
+	    $("id_domain").options[0].setProperty("selected", "selected");
+	    domadminform_init();
+	}
+    }
+};
 
-	event.stop();
-	form.set('send', {
-	    onSuccess: function(responseText) {
-		var response = JSON.decode(responseText);
+var extra_data_callbacks = {
 
-                if (response.status == "ko") {
-                    $(document.body).set("html", response.content);
-		    $(document.body).addEvent("submit", default_submit);
-		    if ($defined(error_callbacks[myid])) {
-			error_callbacks[myid]();
-		    }
-                } else {
-                    if (response.url != "") {
-                        parent.location.href = response.url;			
-		    }
-                    parent.SqueezeBox.close();
+};
+
+function register_callback(hash, name, callback) {
+    if ($defined(hash[name])) {
+        return false;
+    }
+    hash[name] = callback;
+    return true;
+}
+
+function register_error_callback(name, callback) {
+    return register_callback(error_callbacks, name, callback);
+}
+
+function register_extra_data_callback(name, callback) {
+    return register_callback(extra_data_callbacks, name, callback);
+}
+
+function ajax_submit(event) {
+    var form = event.target;
+    var myid = form.get("id");
+    var data = form.toQueryString();
+    
+    event.stop();
+    if ($defined(extra_data_callbacks[myid])) {
+        if (data != "") {
+            data += "&";
+        }
+        data += extra_data_callbacks[myid]();
+    }
+
+    new Request({
+        method: form.get("method"),
+        data: data,
+        onSuccess: function(responseText) {
+	    var response = JSON.decode(responseText);
+            
+            if (response.status == "ko") {
+                $(document.body).set("html", response.content);
+		$(document.body).addEvent("submit", ajax_submit);
+		if ($defined(error_callbacks[myid])) {
+		    error_callbacks[myid]();
+		}
+            } else {
+                if ($defined(response.url) && response.url != "") {
+                    parent.location.href = response.url;			
+		}
+                if ($defined(response.ajaxnav)) {
+                    parent.current_anchor.update(1);
                 }
-            },
-	    onFailure: function(xhr) {
-		parent.document.getElement('iframe').setStyles({width: 800, height: 600});
-		$(document.body).set("html", xhr.responseText);
-	    }
-        });
-        form.send();
-    };
+                parent.SqueezeBox.close();
+            }
+        },
+	onFailure: function(xhr) {
+	    parent.document.getElement('iframe').setStyles({width: 800, height: 600});
+	    $(document.body).set("html", xhr.responseText);
+	}
+    }).send();
+}
 
-    default_submit = function(event) {
-	var error_callbacks = {
-	    mbaliasform: function() {
-		if ($("id_domain").value == 0) {
-		    $("id_mboxes").set("html", "");
-		}
-		mbaliasform_init();
-	    },
-	    armform: function() {
-		new Calendar({id_untildate: "Y-m-d"}, {
-		    tweak: {x: -100, y:-100}
-		});
-	    },
-	    permform: function() {
-		if ($defined($("id_domain"))) {
-		    $("id_domain").options[0].setProperty("selected", "selected");
-		    domadminform_init();
-		}
-	    }
-	};
-
-	ajax_submit(event, error_callbacks);
-    };
-
-    $(document.body).addEvent("submit", default_submit);
+window.addEvent("domready", function() {
+    $(document.body).addEvent("submit", ajax_submit);
 
     $$("input[type!=submit]", "select").addEvents({
 	focus: function(evt) {