function getCookie(name) {
  var dc = document.cookie;
  var prefix = name + "=";
  var begin = dc.indexOf("; " + prefix);
  if (begin == -1) {
    begin = dc.indexOf(prefix);
    if (begin != 0) return null;
  } else
    begin += 2;
  var end = document.cookie.indexOf(";", begin);
  if (end == -1)
    end = dc.length;
  return unescape(dc.substring(begin + prefix.length, end));
}

function getYamCookieValue(cookie , name) {
    var prefix = name+"=";
    var begin = cookie.indexOf("&"+prefix);
    if(begin == -1 ){
        begin = cookie.indexOf(prefix);
        if(begin !=0 ) return '' ;
    }else{
        begin +=2 ;
    }
    var end = cookie.indexOf("&",begin);
    if(end == -1){
        end = cookie.length ;
    }
    return unescape(cookie.substring(begin+prefix.length,end));
}

function guestbookReply( replyURL ){
  co_member = getCookie('co_member');
  yam_id = null;
  if(co_member!=null){
    yam_id = getYamCookieValue(co_member,'ID');
  }

  if ( yam_id != null && guestbook_owner == yam_id && guestbook_owner != null && guestbook_owner != '') {
    document.write(' 【<a href="' + replyURL + '">回應</a>】');
  }
}

function guestbookDelete( deleteURL ){
  co_member = getCookie('co_member');
  yam_id = null;
  if(co_member!=null){
    yam_id = getYamCookieValue(co_member,'ID');
  }

  if ( yam_id != null && guestbook_owner == yam_id && guestbook_owner != null && guestbook_owner != '') {
    document.write('<div align="right"><a href="' + deleteURL + '" onclick="if(confirm(\'確定要刪除此筆留言嗎?\')) return true; else return false;">刪除</a></div>');
  }
}