root/trunk/website/blog/cfformprotect/js/usedKeyboard.js @ 37

var keysPressed = 0;
//capture when a user uses types on their keyboard
document.onkeypress = logKeys;

function logKeys() {
        //user hit a key, increment the counter
        keysPressed++;
        //load the amount to hidden form field
        document.getElementById("formfield1234567892").value = keysPressed;
}