Restore this default panels

How to restore this default panels.

1. Applications->Accessories->Terminal
Type this command and all panels will disappear.
$ sudo gconftool --recursive-unset /apps/panel

2. Then,type this to delete current one:
$ sudo rm -rf ~/.gconf/apps/panel

3. Finally,reload panel:
$ sudo pkill gnome-panel

4. Reboot system:
$ sudo reboot