var updateChar = function(FieldName, mententname, textlimitname){
    var strCount = 0;
    var tempStr, tempStr2;
    for(i = 0;i < document.getElementById(mententname).value.length;i++)
    {
        tempStr = document.getElementById(mententname).value.charAt(i);
        if(escape(tempStr).length > 4) strCount += 2;
            else strCount += 1 ;
    }
    if (strCount > FieldName){
        alert("댓글을 " + FieldName + "byte미만으로 입력해주시기 바랍니다.");
        strCount = 0;
        tempStr2 = "";
        for(i = 0; i < document.getElementById(mententname).value.length; i++)
        {
            tempStr = document.getElementById(mententname).value.charAt(i);
            if(escape(tempStr).length > 4) strCount += 2;
            else strCount += 1 ;
            if (strCount > FieldName)
            {
                if(escape(tempStr).length > 4) strCount -= 2;
                else strCount -= 1 ;
                break;
            }
            else tempStr2 += tempStr;
        }
        document.getElementById(mententname).value = tempStr2;
    }
    document.getElementById(textlimitname).innerHTML = strCount;
};