how to make a button which prints the page

hi there,

i am looking for a code to make a button print the webpage. in fact the same function as ‘print page’ of your browser, but executed by a button.
any suggestions or experience with this?

http://courage.amsterdam/death-by-powerpoint-bingo/

and while you are at it, is it possible to execute a ‘refresh’command by clicking on a button too?

thanks for your thoughts,

Z