diff --git a/src/commands/cmd_frame_properties.c b/src/commands/cmd_frame_properties.c
new file mode 100644
index 000000000..4984ca075
--- /dev/null
+++ b/src/commands/cmd_frame_properties.c
@@ -0,0 +1,89 @@
+/* ASE - Allegro Sprite Editor
+ * Copyright (C) 2007  David A. Capello
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
+ */
+
+#include "config.h"
+
+#ifndef USE_PRECOMPILED_HEADER
+
+#include "jinete.h"
+
+/* #include "core/app.h" */
+#include "modules/gui.h"
+#include "modules/sprites.h"
+/* #include "raster/cel.h" */
+/* #include "raster/layer.h" */
+#include "raster/sprite.h"
+/* #include "raster/undo.h" */
+
+#endif
+
+void dialogs_frame_length(int sprite_frame);
+
+bool command_enabled_frame_properties(const char *argument)
+{
+  return current_sprite != NULL;
+}
+
+void command_execute_frame_properties(const char *argument)
+{
+  dialogs_frame_length(current_sprite->frame);
+}
+
+/* if sprite_frame < 0, set the frame length of all frames */
+void dialogs_frame_length(int sprite_frame)
+{
+  JWidget window, frame, frlen, ok;
+  char buf[64];
+
+  window = load_widget("frlen.jid", "frame_duration");
+  if (!window)
+    return;
+
+  if (!get_widgets(window,
+		   "frame", &frame,
+		   "frlen", &frlen,
+		   "ok", &ok, NULL)) {
+    jwidget_free(window);
+    return;
+  }
+
+  if (sprite_frame < 0)
+    strcpy(buf, "All");
+  else
+    sprintf(buf, "%d", sprite_frame+1);
+  jwidget_set_text(frame, buf);
+
+  sprintf(buf, "%d", sprite_get_frlen(current_sprite, current_sprite->frame));
+  jwidget_set_text(frlen, buf);
+
+  jwindow_open_fg(window);
+  if (jwindow_get_killer(window) == ok) {
+    int num = strtol(jwidget_get_text(frlen), NULL, 10);
+
+    if (sprite_frame < 0) {
+      if (jalert("Warning"
+		 "<<Do you want change the frame-rate of all frames?"
+		 "<<(this operation can\'t be undoed)"
+		 "||&Yes||&No") == 1)
+	sprite_set_speed(current_sprite, num);
+    }
+    else
+      sprite_set_frlen(current_sprite, num, sprite_frame);
+  }
+  jwidget_free(window);
+}
diff --git a/src/commands/cmd_new_frame.c b/src/commands/cmd_new_frame.c
new file mode 100644
index 000000000..97f5859ba
--- /dev/null
+++ b/src/commands/cmd_new_frame.c
@@ -0,0 +1,145 @@
+/* ASE - Allegro Sprite Editor
+ * Copyright (C) 2007  David A. Capello
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
+ */
+
+#include "config.h"
+
+#ifndef USE_PRECOMPILED_HEADER
+
+#include "jinete.h"
+
+#include "console/console.h"
+#include "core/app.h"
+#include "modules/gui.h"
+#include "modules/color.h"
+#include "modules/sprites.h"
+#include "raster/cel.h"
+#include "raster/image.h"
+#include "raster/layer.h"
+#include "raster/sprite.h"
+#include "raster/stock.h"
+#include "raster/undo.h"
+#include "widgets/colbar.h"
+
+#endif
+
+static bool new_frame_for_layer(Sprite *sprite, Layer *layer, int frame);
+static bool copy_cel_in_next_frame(Sprite *sprite, Layer *layer, int frame);
+
+bool command_enabled_new_frame(const char *argument)
+{
+  return
+    current_sprite &&
+    current_sprite->layer &&
+    current_sprite->layer->readable &&
+    current_sprite->layer->writable &&
+    layer_is_image(current_sprite->layer);
+}
+
+void command_execute_new_frame(const char *argument)
+{
+  Sprite *sprite = current_sprite;
+
+  undo_open(sprite->undo);
+
+  /* add a new cel to every layer */
+  new_frame_for_layer(sprite,
+		      sprite->set,
+		      sprite->frame+1);
+
+  /* increment frames counter in the sprite */
+  undo_set_frames(sprite->undo, sprite);
+  sprite_set_frames(sprite, sprite->frames+1);
+
+  /* go to next frame (the new one) */
+  undo_int(sprite->undo, &sprite->gfxobj, &sprite->frame);
+  sprite_set_frame(sprite, sprite->frame+1);
+
+  /* close undo & refresh the screen */
+  undo_close(sprite->undo);
+  update_screen_for_sprite(sprite);
+}
+
+static bool new_frame_for_layer(Sprite *sprite, Layer *layer, int frame)
+{
+  switch (layer->gfxobj.type) {
+
+    case GFXOBJ_LAYER_IMAGE: {
+      Cel *cel;
+      int c;
+
+      for (c=sprite->frames-1; c>=frame; --c) {
+	cel = layer_get_cel(layer, c);
+	if (cel) {
+	  undo_int(sprite->undo, &cel->gfxobj, &cel->frame);
+	  cel->frame++;
+	}
+      }
+
+      if (!copy_cel_in_next_frame(sprite, layer, frame))
+	return FALSE;
+
+      break;
+    }
+
+    case GFXOBJ_LAYER_SET: {
+      JLink link;
+      JI_LIST_FOR_EACH(layer->layers, link) {
+	if (!new_frame_for_layer(sprite, link->data, frame))
+	  return FALSE;
+      }
+      break;
+    }
+
+    case GFXOBJ_LAYER_TEXT:
+      /* TODO */
+      break;
+  }
+
+  return TRUE;
+}
+
+static bool copy_cel_in_next_frame(Sprite *sprite, Layer *layer, int frame)
+{
+  int bg, image_index;
+  Image *image;
+  Cel *cel;
+
+  /* create a new empty cel with a new clean image */
+  image = image_new(sprite->imgtype, sprite->w, sprite->h);
+  if (!image) {
+    console_printf(_("Not enough memory.\n"));
+    return FALSE;
+  }
+
+  /* background color (right color) */
+  bg = get_color_for_image(image->imgtype,
+			   color_bar_get_color(app_get_color_bar(), 1));
+  image_clear(image, bg);
+
+  /* add the image in the stock */
+  image_index = stock_add_image(layer->stock, image);
+
+  undo_add_image(sprite->undo, layer->stock, image);
+
+  /* add the cel in the layer */
+  cel = cel_new(frame, image_index);
+  undo_add_cel(sprite->undo, sprite->layer, cel);
+  layer_add_cel(layer, cel);
+
+  return TRUE;
+}
diff --git a/src/commands/cmd_remove_frame.c b/src/commands/cmd_remove_frame.c
new file mode 100644
index 000000000..eb192b53e
--- /dev/null
+++ b/src/commands/cmd_remove_frame.c
@@ -0,0 +1,98 @@
+/* ASE - Allegro Sprite Editor
+ * Copyright (C) 2007  David A. Capello
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
+ */
+
+#include "config.h"
+
+#ifndef USE_PRECOMPILED_HEADER
+
+#include "jinete.h"
+
+#include "modules/gui.h"
+#include "modules/sprites.h"
+#include "raster/cel.h"
+#include "raster/layer.h"
+#include "raster/sprite.h"
+#include "raster/undo.h"
+#include "script/functions.h"
+
+#endif
+
+static void remove_frame_for_layer(Sprite *sprite, Layer *layer, int frame);
+
+bool command_enabled_remove_frame(const char *argument)
+{
+  return
+    current_sprite != NULL &&
+    current_sprite->frames > 1;
+}
+
+void command_execute_remove_frame(const char *argument)
+{
+  Sprite *sprite = current_sprite;
+
+  undo_open(sprite->undo);
+
+  /* remove cels from this frame (and displace one position backward
+     all next frames) */
+  remove_frame_for_layer(sprite, sprite->set, sprite->frame);
+
+  /* decrement frames counter in the sprite */
+  undo_set_frames(sprite->undo, sprite);
+  sprite_set_frames(sprite, sprite->frames-1);
+
+  /* move backward if we are outside the range of frames */
+  if (sprite->frame >= sprite->frames) {
+    undo_int(sprite->undo, &sprite->gfxobj, &sprite->frame);
+    sprite_set_frame(sprite, sprite->frames-1);
+  }
+
+  undo_close(sprite->undo);
+  update_screen_for_sprite(current_sprite);
+}
+
+static void remove_frame_for_layer(Sprite *sprite, Layer *layer, int frame)
+{
+  switch (layer->gfxobj.type) {
+
+    case GFXOBJ_LAYER_IMAGE: {
+      Cel *cel = layer_get_cel(layer, frame);
+      if (cel)
+	RemoveCel(layer, cel);
+
+      for (++frame; frame<sprite->frames; ++frame) {
+	cel = layer_get_cel(layer, frame);
+	if (cel) {
+	  undo_int(sprite->undo, &cel->gfxobj, &cel->frame);
+	  cel->frame--;
+	}
+      }
+      break;
+    }
+
+    case GFXOBJ_LAYER_SET: {
+      JLink link;
+      JI_LIST_FOR_EACH(layer->layers, link)
+	remove_frame_for_layer(sprite, link->data, frame);
+      break;
+    }
+
+    case GFXOBJ_LAYER_TEXT:
+      /* TODO */
+      break;
+  }
+}