var open_senderbox=0;
function reply(comment_id){
    var comment=document.getElementById('comment'+comment_id);
    var senderbox=document.getElementById('senderbox');
    var parent_id=document.getElementById('parent_id');
    if(open_senderbox!=0 && open_senderbox!=comment_id){
        document.getElementById('comment'+open_senderbox).innerHTML='';
    }
    if(comment.innerHTML==''){
        parent_id.value=comment_id;
        comment.innerHTML=senderbox.innerHTML;
    }else comment.innerHTML='';
    open_senderbox=comment_id;
}

function limitText(limitField, limitCount, limitNum) {
  if(limitField.value.length>limitNum){
    limitField.value=limitField.value.substring(0,limitNum);
  }else{
    limitCount.value=limitNum-limitField.value.length;
  }
}