That has been discussed here: http://arduino.cc/forum/index.php/topic,107967.0.html and here: http://arduino.cc/forum/index.php/topic,104615.0.html.
That has been discussed here: http://arduino.cc/forum/index.php/topic,107967.0.html and here: http://arduino.cc/forum/index.php/topic,104615.0.html.