function chkMsgLength(intMax,objMsg, txtLen) {
	var st = document.getElementById(txtLen);
	var length = lengthMsg(objMsg.value);
	st.innerHTML = length;//ÇöÀç byte¼ö¸¦ ³Ö´Â´Ù
	if (length > intMax) {
		alert("ÃÖ´ë " + intMax + "byteÀ̹ǷΠÃÊ°úµÈ ±ÛÀÚ¼ö´Â ÀÚµ¿À¸·Î »èÁ¦µË´Ï´Ù.\n");
		objMsg.value = objMsg.value.replace(/\r\n$/, "");
		objMsg.value = assertMsg(intMax,objMsg.value,st );
	}
}

 

function lengthMsg(objMsg) {
	var nbytes = 0;
	for (i=0; i<objMsg.length; i++) {
		var ch = objMsg.charAt(i);
		if(escape(ch).length > 4) {
			nbytes += 2;
		}else if (ch == '\n') {
			if (objMsg.charAt(i-1) != '\r') {
				nbytes += 1;
			}
		}else if (ch == '<' || ch == '>') {
			nbytes += 4;
		} else {
			nbytes += 1;
		}
	}
	return nbytes;
}

 

function assertMsg(intMax,objMsg,st ) {
	var inc = 0;
	var nbytes = 0;
	var msg = "";

	var msglen = objMsg.length;
	for (i=0; i<msglen; i++) {
		var ch = objMsg.charAt(i);
		if (escape(ch).length > 4) {
			inc = 2;
		}else if (ch == '\n') {
			if (objMsg.charAt(i-1) != '\r') {
				inc = 1;
			}
		}else if (ch == '<' || ch == '>') {
			inc = 4;
		}else {
			inc = 1;
		}
		if ((nbytes + inc) > intMax) {
		 break;
		}
		nbytes += inc;
		msg += ch;
	}
	st.innerHTML = nbytes; //ÇöÀç byte¼ö¸¦ ³Ö´Â´Ù
	return msg;
}