diff --git a/contrib/js/nntpchan/post-reply.js b/contrib/js/nntpchan/post-reply.js
new file mode 100644
index 0000000..68e5e2e
--- /dev/null
+++ b/contrib/js/nntpchan/post-reply.js
@@ -0,0 +1,186 @@
+/**
+ post reply box
+ */
+
+
+function table_insert_row(table, header, items) {
+    var tr = document.createElement("tr");
+    // insert header element
+    var th = document.createElement("th");
+    th.appendChild(header);
+    tr.appendChild(th);
+    // insert the rest of the elements
+    for (var idx = 0; idx < items.length; idx ++ ) {
+        var elem = document.createElement("td");
+        elem.appendChild(items[idx]);
+        tr.appendChild(elem);
+    }
+    table.appendChild(tr);
+}
+
+/**
+ reply box
+ */
+function ReplyBox() {
+    var elem = document.createElement("div");
+    this.elem = elem;
+    // reference
+    elem = document.createElement("input");
+    elem.name = "reference";
+    elem.type = "hidden";
+    this.elem.appendChild(elem);
+
+    var table = document.createElement("table");
+    table.setAttribute("class", "postform");
+    var tbody = document.createElement("tbody");
+
+    var span = document.createElement("span");
+    // name 
+    elem = document.createElement("input");
+    elem.setAttribute("name", "name");
+    elem.setAttribute("value", "Anonymous");
+    span.appendChild(elem);
+    // error message
+    var err_elem = document.createElement("span");
+    span.appendChild(err_elem);
+    this._error = err_elem;
+    table_insert_row(tbody, document.createTextNode("Name"), [span]);
+    
+    // subject
+    elem = document.createElement("input");
+    elem.setAttribute("value", "");
+    this.subject = elem;
+    // submit
+    var submit = document.createElement("button");
+    submit.setAttribute("value", "reply");
+    submit.setAttribute("class", "button");
+    table_insert_row(tbody, document.createTextNode("Subject"), [elem, submit]);
+    this.submit = submit;
+    
+    // Comment
+    elem = document.createElement("textarea");
+    elem.setAttribute("cols", "40");
+    elem.setAttribute("rows", "5");
+    table_insert_row(tbody, document.createTextNode("Comment"), [elem]);
+    this.message = elem;
+    
+    // file
+    elem = document.createElement("input");
+    elem.setAttribute("class", "postform_attachment");
+    elem.setAttribute("type", "file");
+    elem.setAttribute("multiple", "multiple");
+    this.files = elem;
+    table_insert_row(tbody, document.createTextNode("Files"), [elem]);
+
+    // captcha
+    elem = document.createElement("img");
+    elem.alt = "captcha";
+    table_insert_row(tbody, document.createTextNode("Captcha"), [elem]);
+    this.captcha_img = elem;
+
+    // captcha solution
+    elem = document.createElement("input");
+    elem.name = "captcha";
+    elem.autocomplete = "off";
+    table_insert_row(tbody, document.createTextNode("Solution"), [elem]);
+    this.captcha_solution = elem;
+    table.appendChild(tbody);
+    this.elem.appendChild(table);
+}
+
+ReplyBox.prototype.result = function(msg, color) {
+    var self = this;
+    self._error.innerHTML = "";
+    $(self._error).css("color", color);
+    self._error.appendChild(document.createTextNode(msg));
+    setTimeout(function() {
+        $(self._error).fadeout(1000, function() {
+            self._error.innerHTML = "";
+        });
+    }, 1000);
+}
+
+
+ReplyBox.prototype.makePost = function(info) {
+    var self = this;
+    var data = new FormData();
+    data.append("name", self.name.value);
+    data.append("subject", self.subject.value);
+    data.append("captcha", self.captcha_solution.value);
+    data.append("message", self.message.value);
+    $(self.files.files).each(function(_, f) {
+        data.append("attachment_uploaded", f);
+    });
+    data.append("reference", info.reference);
+    return data;
+}
+
+ReplyBox.prototype.clear = function() {
+    var self = this;
+    self.name.value = "";
+    self.subject.value = "";
+    self.message.value = "";
+    self.captcha_solution.value = "";
+}
+
+ReplyBox.prototype.reload = function() {
+    self.captcha_img.src = "/captcha/img?" + new Date().getTime();
+}
+
+ReplyBox.prototype.show = function(info) {
+    var self = this;
+    $(self.elem).css("display", "inline-block");
+    self.submit.onclick = function(ev) {
+        $.ajax({
+            data: self.makePost(info),
+            url: info.url,
+            method: "POST",
+            dataType: "json"
+        }).success(function(data, status, xhr) {
+            if(xhr.statusCode == 201) {
+                self.result("posted as "+data.message_id, "green");
+                self.clear();
+                self.submit.onclick = function(ev) {};
+            } else {
+                self.result("error: " + data.error, "red");
+            }
+        }).fail(function() {
+            self.result("request failed", "red");
+        }).done(function() {
+            self.reload();
+        });
+    };
+}
+
+ReplyBox.prototype.hide = function() {
+    var self = this;
+    $(self.elem).css("display", "none");
+    self.submit.onclick = function(ev) {};
+}
+
+onready(function(){
+    var replyBox = new ReplyBox();
+    replyBox.hide();
+    $(".post").each(function(_, elem) {
+        var replyInfo = {
+            url: (prefix || "/") + "post/" + elem.dataset.newsgroup + "/json",
+            reference: elem.dataset.rootmsgid,
+            board: elem.dataset.newsgroup,
+            elem: elem
+        };
+        var elems = elem.getElementsByClassName("postreply");
+        if(elems && elems[0]) {
+            var e = elems[0].children[1];
+            e.onclick = function(ev) {
+                if(!replyInfo.show) {
+                    // is hidden, show reply
+                    replyBox.show(replyInfo);
+                } else {
+                    // is open, hide reply
+                    replyBox.hide();
+                }
+                replyInfo.show = ! replyInfo.show;
+            }
+        }
+    });
+});