Help adding "ENTER" key in code please

Hi.
I need some help working out how to add the “ENTER” key as an option as well as the onRelease mouse function to this script please.

var password:String;
Selection.setFocus(“password_txt”);
continue_btn.onRelease = function()
{
password = password_txt.text;
play();
}

Many thanks.
Bidge (actionscript beginner)