//새로고침(F5), 전체창(F11) 막기
function processKey() {
	if( (event.ctrlKey == true && (event.keyCode == 78 || event.keyCode == 82 || event.keyCode == 67))
		|| (event.keyCode >= 112 && event.keyCode <= 123)) { 
		event.keyCode = 0; 
		event.cancelBubble = true; 
		event.returnValue = false; 
	} 
} 
document.onkeydown = processKey;