function cal_byte2(kkk, aquery, sss) 
{
	var tmpStr;
	var temp=0;
	var onechar;
	var tcount;
	tcount = 0;
	tmpStr = new String(aquery);
	temp = tmpStr.length;
	for (k=0;k<temp;k++)
	{
		onechar = tmpStr.charAt(k);
		if (escape(onechar) =='%0D') { } else if (escape(onechar).length > 4) { tcount += 2; } else { tcount++; }
	}
	if(tcount>sss) {
		reserve = tcount-sss;
		alert(sss+" ¹ÙÀÌÆ® ÀÌ»óÀº ÀÔ·ÂÇÏ½Ç ¼ö ¾ø½À´Ï´Ù.\r\n ÀÔ·ÂÇϽŠ³»¿ëÀº "+reserve+"¹ÙÀÌÆ®°¡ ÃÊ°úµÇ¾ú½À´Ï´Ù.\r\n ÃÊ°úµÈ ºÎºÐÀº ÀÚµ¿À¸·Î »èÁ¦µË´Ï´Ù."); 
		cutText2(kkk, sss);
	} else {
//	   document.all.setbytes.innerHTML = tcount; 
	}

	return;
}

function cutText2(kkk, sss)
{
	nets_check2(kkk, kkk.value, sss);
}

function cal_pre(kkk, sss)
{	
	var tmpStr;

	tmpStr = kkk.value;
	cal_byte2(kkk, tmpStr, sss);
}
function nets_check2(kkk, aquery, sss)
{

	var tmpStr;
	var temp=0;
	var onechar;
	var tcount;
	tcount = 0;

	tmpStr = new String(aquery);
	temp = tmpStr.length;

	for(k=0;k<temp;k++)
	{
		onechar = tmpStr.charAt(k);

		if(escape(onechar).length > 4) {
			tcount += 2;
		} else {			
			if(escape(onechar)=='%0A') {
        tcount++;
			} else {
				tcount++;
			}
		}
    
		if(tcount>sss) {
			tmpStr = tmpStr.substring(0,k);
			break;
		}

	}
	kkk.value = tmpStr;
	cal_byte2(kkk,tmpStr,sss);

}


<!-- ¹®ÀÚÀÇ °¹¼ö¸¦ °Ë»çÇÏ´Â ½ºÅ©¸³Æ® ½ÃÀÛ -->
function cal_byte(aquery) 
{
	var tmpStr;
	var temp=0;
	var onechar;
	var tcount;
	tcount = 0;
	tmpStr = new String(aquery);
	temp = tmpStr.length;
	for (k=0;k<temp;k++)
	{
		onechar = tmpStr.charAt(k);
		if (escape(onechar) =='%0D') { } else if (escape(onechar).length > 4) { tcount += 2; } else { tcount++; }
	}
	if(tcount>400) {
		reserve = tcount-400;
		alert(" 400¹ÙÀÌÆ® ÀÌ»óÀº ÀÔ·ÂÇÏ½Ç ¼ö ¾ø½À´Ï´Ù.\r\n ÀÔ·ÂÇϽŠ³»¿ëÀº "+reserve+"¹ÙÀÌÆ®°¡ ÃÊ°úµÇ¾ú½À´Ï´Ù.\r\n ÃÊ°úµÈ ºÎºÐÀº ÀÚµ¿À¸·Î »èÁ¦µË´Ï´Ù."); 
		cutText();
	} else {
	   document.all.setbytes.innerHTML = tcount; 
	}
	return;
}

function cutText()
{
	nets_check(document.input_comment.comment.value);
}

function cal_pre400()
{	
	var tmpStr;

	tmpStr = document.input_comment.comment.value;
	cal_byte(tmpStr);
}
function nets_check(aquery)
{

	var tmpStr;
	var temp=0;
	var onechar;
	var tcount;
	tcount = 0;

	tmpStr = new String(aquery);
	temp = tmpStr.length;

	for(k=0;k<temp;k++)
	{
		onechar = tmpStr.charAt(k);

		if(escape(onechar).length > 4) {
			tcount += 2;
		} else {			
			if(escape(onechar)=='%0A') {
				tcount++;
			} else {
				tcount++;
			}
		}

		if(tcount>400) {
			tmpStr = tmpStr.substring(0,k);
			break;
		}

	}
	document.input_comment.comment.value = tmpStr;
	cal_byte(tmpStr);

}
<!-- ¹®ÀÚÀÇ °¹¼ö¸¦ °Ë»çÇÏ´Â ½ºÅ©¸³Æ® ³¡ -->