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Espruino is a JavaScript interpreter for low-power Microcontrollers. This site is both a support community for Espruino and a place to share what you are working on.
@mikewop
Did you try lcd.setCursor(1,0) to get to the second line?
http://www.espruino.com/HD44780
At a low level, it seems this is based on the LCD controller(s) used in the display. See here: http://forum.arduino.cc/index.php/topic,123864.0.html (Reply #5).