// ===============================================================================================
// keyboard functions
// ===============================================================================================
document.onkeyup = keyup;

function keyup(e) {
    var i = 0;
    var j = 0;
    var keyid = (window.event) ? event.keyCode : e.keyCode;
    if (bool_ingame == true) {
        guess_letter(String.fromCharCode(keyid).toLowerCase());
    }
}