function fgn_no_chksum(reg_no) {
    var sum = 0;
    var odd = 0;
    
    buf = new Array(13);
    for (i = 0; i < 13; i++) buf[i] = parseInt(reg_no.charAt(i));

    odd = buf[7]*10 + buf[8];
    
    if (odd%2 != 0) {
      return false;
    }

    if ((buf[11] != 6)&&(buf[11] != 7)&&(buf[11] != 8)&&(buf[11] != 9)) {
      return false;
    }
     
    multipliers = [2,3,4,5,6,7,8,9,2,3,4,5];
    for (i = 0, sum = 0; i < 12; i++) sum += (buf[i] *= multipliers[i]);


    sum=11-(sum%11);
    
    if (sum>=10) sum-=10;

    sum += 2;

    if (sum>=10) sum-=10;

    if ( sum != buf[12]) {
        return false;
    }
    else {
        return true;
    }
}

 
function check_no(){
	var theform = document.Form1;
	var J1 = theform.txtResNo1.value;
	var J2 = theform.txtResNo2.value;
    var fgn_reg_no = theform.txtResNo1.value + theform.txtResNo2.value ;   
	
	if (fgn_reg_no == ''){
  alert('¿Ü±¹Àεî·Ï¹øÈ£¸¦ ÀÔ·ÂÇϽʽÿÀ.');
  return false;
 }
	if (isNaN(J1) || isNaN(J2)) 
				{ 
				J1 = "" 
				J2 = "" 
				alert('¿Ü±¹Àεî·Ï¹øÈ£´Â ¼ýÀÚ¸¸ °¡´ÉÇÕ´Ï´Ù.'); 
				return false; 
				} 	
		
 

 if (fgn_reg_no.length != 13) {
  alert('¿Ü±¹Àεî·Ï¹øÈ£ ÀÚ¸®¼ö°¡ ¸ÂÁö ¾Ê½À´Ï´Ù.');
  return false;
 }
    
	if ((fgn_reg_no.charAt(6) == "5") || (fgn_reg_no.charAt(6) == "6"))
        {
           birthYear = "19";
        }
        else if ((fgn_reg_no.charAt(6) == "7") || (fgn_reg_no.charAt(6) == "8"))
        {
           birthYear = "20";
        }
        else if ((fgn_reg_no.charAt(6) == "9") || (fgn_reg_no.charAt(6) == "0"))
        {
           birthYear = "18";
        }
        else
        {
          alert("µî·Ï¹øÈ£¿¡ ¿À·ù°¡ ÀÖ½À´Ï´Ù. ´Ù½Ã È®ÀÎÇϽʽÿÀ.");
          return false;
        }        
        birthYear += fgn_reg_no.substr(0, 2);
        birthMonth = fgn_reg_no.substr(2, 2) - 1;
        birthDate = fgn_reg_no.substr(4, 2);
        birth = new Date(birthYear, birthMonth, birthDate);
        
        if ( birth.getYear() % 100 != fgn_reg_no.substr(0, 2) ||
             birth.getMonth() != birthMonth ||
             birth.getDate() != birthDate) {
          alert('»ý³â¿ùÀÏ¿¡ ¿À·ù°¡ ÀÖ½À´Ï´Ù. ´Ù½Ã È®ÀÎÇϽʽÿÀ.');
          return false;
        }
        
        if (fgn_no_chksum(fgn_reg_no) == false){
        
            alert('¿Ü±¹Àεî·Ï¹øÈ£¿¡ ¿À·ù°¡ ÀÖ½À´Ï´Ù. ´Ù½Ã È®ÀÎÇϽʽÿÀ.');
            return false;
        }
    return true;
}