function processKey()
{ 
	//if((event.ctrlKey == true && (event.keyCode == 78 || event.keyCode == 82)) || (event.altKey == true && (event.keyCode >= 37 || event.keyCode <= 40)) || (event.keyCode >= 112 && event.keyCode <= 123) || event.keyCode == 8)

	// Input ÅÂ±× ¾È¿¡¼­´Â Backspace(8), tab(9) Çã¿ë
	if(document.activeElement.type=="text" || document.activeElement.type=="password" || document.activeElement.type=="textarea"){
		if((event.ctrlKey == true && (event.keyCode == 78 || event.keyCode == 82)) || (event.keyCode >= 112 && event.keyCode < 116) || (event.keyCode > 116 && event.keyCode <= 123))
		{
			event.keyCode = 0;
			event.cancelBubble = true;
			event.returnValue = false;
		}
	}
	// Backspace »ç¿ëºÒ°¡
	else{
		if((event.ctrlKey == true && (event.keyCode == 78 || event.keyCode == 82)) || (event.keyCode >= 112 && event.keyCode < 116) || (event.keyCode > 116 && event.keyCode <= 123) || event.keyCode == 9 || event.keyCode == 8)
		{
			event.keyCode = 0;
			event.cancelBubble = true;
			event.returnValue = false;
		}
	}
}

document.onkeydown = processKey;