typewriter keyboard

hi everyone, i am building external interactive keyboard similar as normal computer keyboard (see attached patch, only lower case are working now) i really don't know javascript at all but i wrote simple script and it's somehow working. my problem is to put "return" in the script. push "return" and make a new line. any suggestion how to do it, pls? thank you in advance!

ps.: i know "kineme freeboard" object but i need to use different solution.