button PRINT

I want add button PRINT to my artikel. How? And how do my site good for print. I read about java script, but I dont understood it.
I mean, that I copy some code, which give to the end of artikel... I dont know

you’ll need to use JS to open the Print Dialog, look at some examples here:
http://www.javascriptkit.com/howto/newtech2.shtml

and you’ll also want to make a print.css file to be used on printed pages, look here for more info:
http://www.alistapart.com/articles/goingtoprint/