새로고침(F5) 전체창(F11) 못하게 막기

<SCRIPT LANGUAGE="JavaScript">
function processKey()
{
        if( (event.ctrlKey == true && (event.keyCode == 78 || event.keyCode == 82)) ||
        (event.keyCode >= 112 && event.keyCode <= 123) || event.keyCode == 8)
            {
        event.keyCode = 0;
        event.cancelBubble = true;
        event.returnValue = false;
            }
}

document.onkeydown = processKey;

</script>