Ubuntu Enable/Disable Laptop TouchPad with a mouse click or Automatically

Hi everyone,

When I was searching for Ubuntu live desktops, I found the following as an interesting for Ubuntu users.

We can install a software which can Enable/Disable Laptop TouchPad with a click.

Please see this link
http://ubuntuguide.net/quickly-enabledisable-laptop-touchpad-with-touchpad-indicator-in-ubuntu-10-10

Please see the related link, which can automatically Disables/Enable the Touchpad when External mouse connected.

http://ubuntuguide.net/touchpad-indicator-update-auto-disable-touchpad-when-mouse-plugged

Note: The above link has mixed responses.