diff --git a/build-js.sh b/build-js.sh
index e29bd80..0cd3b97 100755
--- a/build-js.sh
+++ b/build-js.sh
@@ -14,6 +14,16 @@ if [ ! -f $GOPATH/bin/minify ]; then
 fi
 outfile=$(readlink -e ./contrib/static/nntpchan.js)
 
+lint() {
+    if [ "x$(which jslint)" == "x" ] ; then
+        # no jslint
+        true
+    else
+        echo "jslint: $1"
+        jslint --browser $1
+    fi
+}
+
 mini() {
     echo "minify $1"
     echo "" >> $2
@@ -21,6 +31,14 @@ mini() {
     $GOPATH/bin/minify --mime=text/javascript >> $2 < $1
 }
 
+# do linting too
+if [ "x$1" == "xlint" ] ; then
+    echo "linting..."
+    for f in ./contrib/js/*.js ; do
+        lint $f
+    done
+fi
+
 echo -e "//For source code and license information please check https://github.com/majestrate/nntpchan \n" > $outfile
 
 mini ./contrib/js/main.js_ $outfile
diff --git a/contrib/js/backlink.js b/contrib/js/backlink.js
index 4f89ba8..20e4063 100644
--- a/contrib/js/backlink.js
+++ b/contrib/js/backlink.js
@@ -1,9 +1,193 @@
-// insert a backlink for a post given its short hash
-function nntpchan_backlink(shorthash) {
+
+var dynreply;
+
+function getReplyTo() {
+  if(!dynreply) {
+    var e = document.getElementById("postform-container");
+    if (e) {
+      // use existing postform
+      dynreply = new DynReply(e);
+    } else {
+      // build a new postform
+      dynreply = new DynReply();
+    }
+  }
+  return dynreply;
+}
+
+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);
+  }
+}
+
+/**
+   build dynamic reply box
+*/
+function DynReply(existingElem) {
+  if (existingElem) {
+    // wrap existing post form
+    this.elem = existingElem;
+    this.form = this.elem.querySelector("form");
+    return;
+  }
+
+  // build new post form
+  
+  var elem = document.createElement("div");
+  elem.setAttribute("id", "postform-container");
+
+  this.elem = elem;
+  // build post form
+  this.form = document.createElement("form");
+  this.form.enctype = "multipart/form-data";
+  this.form.name = "post";
+  this.form.method = "post";
+  // reference
+  elem = document.createElement("input");
+  elem.setAttribute("id", "postform_reference");
+  elem.name = "reference";
+  elem.type = "hidden";
+  this.form.appendChild(elem);
+  
+  var table = document.createElement("table");
+  table.setAttribute("class", "postform");
+  var tbody = document.createElement("tbody");
+
+  // name 
+  elem = document.createElement("input");
+  elem.setAttribute("name", "name");
+  elem.setAttribute("value", "Anonymous");
+  table_insert_row(tbody, document.createTextNode("Name"), [elem])
+  
+  // subject
+  elem = document.createElement("input");
+  elem.setAttribute("name", "subject");
+  elem.setAttribute("value", "");
+  // submit
+  var submit = document.createElement("input");
+  submit.setAttribute("type", "submit");
+  submit.setAttribute("value", "reply");
+  submit.setAttribute("class", "button");
+  table_insert_row(tbody, document.createTextNode("Subject"), [elem, submit]);
+
+  // Comment
+  elem = document.createElement("textarea");
+  elem.setAttribute("id", "postform_message");
+  elem.setAttribute("name", "message");
+  elem.setAttribute("cols", "40");
+  elem.setAttribute("rows", "5");
+  table_insert_row(tbody, document.createTextNode("Comment"), [elem]);
+  
+  // file
+  elem = document.createElement("input");
+  elem.setAttribute("class", "postform_attachment");
+  elem.setAttribute("id", "postform_attachments");
+  elem.setAttribute("type", "file");
+  elem.setAttribute("name", "attachment_uploaded");
+  elem.setAttribute("multiple", "multiple");
+  table_insert_row(tbody, document.createTextNode("Files"), [elem]);
+
+  // dubs
+  elem = document.createElement("input");
+  elem.setAttribute("type", "checkbox");
+  elem.setAttribute("name", "dubs");
+  table_insert_row(tbody, document.createTextNode("Get Dubs"), [elem]);
+
+  // captcha
+  elem = document.createElement("img");
+  elem.setAttribute("id", "captcha_img");
+  elem.alt = "captcha";
+  table_insert_row(tbody, document.createTextNode("Captcha"), [elem]);
+
+  // captcha solution
+  elem = document.createElement("input");
+  elem.name = "captcha";
+  elem.autocomplete = "off";
+  table_insert_row(tbody, document.createTextNode("Name"), [elem])
+    
+  table.appendChild(tbody);
+  this.form.appendChild(table);
+  this.elem.appendChild(this.form);
+  
+  parent.appendChild(this.elem);
+
+  this.board = null;
+  this.roothash = null;
+  this.prefix = null;
+}
+
+DynReply.prototype.update = function() {
+  if (this.prefix) {
+    // update captcha
+    this.updateCaptcha();
+    if (this.board && this.roothash) {
+      // update post form
+      var ref = document.getElementById("postform_reference");
+      ref.value = this.roothash;
+      this.form.action = this.prefix + "post/" + this.board;
+    }
+  }
+}
+
+DynReply.prototype.show = function() {
+  this.update();
+  this.elem.style.display = 'inline';
+}
+
+DynReply.prototype.updateCaptcha = function() {
+  if (this.prefix) {
+    var captcha_img = document.getElementById("captcha_img");
+    captcha_img.src = this.prefix + "captcha/img";
+  }
+}
+
+DynReply.prototype.setPrefix = function(prefix) {
+  this.prefix = prefix;
+}
+
+DynReply.prototype.hide = function() {
+  this.elem.style.display = 'none';
+}
+
+
+DynReply.prototype.setBoard = function(boardname) {
+  if (boardname) {
+    this.board = boardname;
+  }
+}
+
+DynReply.prototype.setRoot = function(roothash) {
+  if (roothash) {
+    this.roothash = roothash;
+  }
+}
+
+// reply box function
+function nntpchan_reply(prefix, parent, shorthash) {
+  if (prefix && parent && parent.roothash && parent.boardname) {
+    var boardname = parent.boardname;
+    var roothash = parent.roothash;
+    var replyto = getReplyTo();
+    // set target
+    replyto.setBoard(boardname);
+    replyto.setRoot(roothash);
+    replyto.setPrefix(prefix);
+    // show it
+    replyto.show();
+  }
   var elem = document.getElementById("postform_message");
   if ( elem )
   {
-    elem.value += ">>" + shorthash.substr(0,10) + "\n";
+      elem.value += ">>" + shorthash.substr(0,10) + "\n";
   }
 }
 
diff --git a/contrib/static/nntpchan.js b/contrib/static/nntpchan.js
index 4206a22..ce459cc 100644
--- a/contrib/static/nntpchan.js
+++ b/contrib/static/nntpchan.js
@@ -11,7 +11,22 @@ handler(j);}};ajax.open("GET",url);ajax.send();}
 function nntpchan_buildpost(parent,j){var post=document.createElement("div");if(j){post.innerHTML=j.PostMarkup;inject_hover_for_element(post);}else{post.setAttribute("class","notfound post");post.appendChild(document.createTextNode("post not found"));}
 parent.appendChild(post);}
 /* ./contrib/js/backlink.js */
-function nntpchan_backlink(shorthash){var elem=document.getElementById("postform_message");if(elem)
+var dynreply;function getReplyTo(){if(!dynreply){var e=document.getElementById("postform-container");if(e){dynreply=new DynReply(e);}else{dynreply=new DynReply();}}
+return dynreply;}
+function table_insert_row(table,header,items){var tr=document.createElement("tr");var th=document.createElement("th");th.appendChild(header);tr.appendChild(th);for(var idx=0;idx<items.length;idx++){var elem=document.createElement("td");elem.appendChild(items[idx]);tr.appendChild(elem);}}
+function DynReply(existingElem){if(existingElem){this.elem=existingElem;this.form=this.elem.querySelector("form");return;}
+var elem=document.createElement("div");elem.setAttribute("id","postform-container");this.elem=elem;this.form=document.createElement("form");this.form.enctype="multipart/form-data";this.form.name="post";this.form.method="post";elem=document.createElement("input");elem.setAttribute("id","postform_reference");elem.name="reference";elem.type="hidden";this.form.appendChild(elem);var table=document.createElement("table");table.setAttribute("class","postform");var tbody=document.createElement("tbody");elem=document.createElement("input");elem.setAttribute("name","name");elem.setAttribute("value","Anonymous");table_insert_row(tbody,document.createTextNode("Name"),[elem])
+elem=document.createElement("input");elem.setAttribute("name","subject");elem.setAttribute("value","");var submit=document.createElement("input");submit.setAttribute("type","submit");submit.setAttribute("value","reply");submit.setAttribute("class","button");table_insert_row(tbody,document.createTextNode("Subject"),[elem,submit]);elem=document.createElement("textarea");elem.setAttribute("id","postform_message");elem.setAttribute("name","message");elem.setAttribute("cols","40");elem.setAttribute("rows","5");table_insert_row(tbody,document.createTextNode("Comment"),[elem]);elem=document.createElement("input");elem.setAttribute("class","postform_attachment");elem.setAttribute("id","postform_attachments");elem.setAttribute("type","file");elem.setAttribute("name","attachment_uploaded");elem.setAttribute("multiple","multiple");table_insert_row(tbody,document.createTextNode("Files"),[elem]);elem=document.createElement("input");elem.setAttribute("type","checkbox");elem.setAttribute("name","dubs");table_insert_row(tbody,document.createTextNode("Get Dubs"),[elem]);elem=document.createElement("img");elem.setAttribute("id","captcha_img");elem.alt="captcha";table_insert_row(tbody,document.createTextNode("Captcha"),[elem]);elem=document.createElement("input");elem.name="captcha";elem.autocomplete="off";table_insert_row(tbody,document.createTextNode("Name"),[elem])
+table.appendChild(tbody);this.form.appendChild(table);this.elem.appendChild(this.form);parent.appendChild(this.elem);this.board=null;this.roothash=null;this.prefix=null;}
+DynReply.prototype.update=function(){if(this.prefix){this.updateCaptcha();if(this.board&&this.roothash){var ref=document.getElementById("postform_reference");ref.value=this.roothash;this.form.action=this.prefix+"post/"+this.board;}}}
+DynReply.prototype.show=function(){this.update();this.elem.style.display='inline';}
+DynReply.prototype.updateCaptcha=function(){if(this.prefix){var captcha_img=document.getElementById("captcha_img");captcha_img.src=this.prefix+"captcha/img";}}
+DynReply.prototype.setPrefix=function(prefix){this.prefix=prefix;}
+DynReply.prototype.hide=function(){this.elem.style.display='none';}
+DynReply.prototype.setBoard=function(boardname){if(boardname){this.board=boardname;}}
+DynReply.prototype.setRoot=function(roothash){if(roothash){this.roothash=roothash;}}
+function nntpchan_reply(prefix,parent,shorthash){if(prefix&&parent&&parent.roothash&&parent.boardname){var boardname=parent.boardname;var roothash=parent.roothash;var replyto=getReplyTo();replyto.setBoard(boardname);replyto.setRoot(roothash);replyto.setPrefix(prefix);replyto.show();}
+var elem=document.getElementById("postform_message");if(elem)
 {elem.value+=">>"+shorthash.substr(0,10)+"\n";}}
 function inject_hover(prefix,el,parent){if(!prefix){throw"prefix is not defined";}
 var linkhash=el.getAttribute("backlinkhash");if(!linkhash){throw"linkhash undefined";}
@@ -24,6 +39,8 @@ for(var elem in ls){inject_hover(prefix,ls[elem]);}}
 function init(prefix){inject_hover_for_element(document);}
 /* ./contrib/js/banner.js */
 var banner_count=3;function nntpchan_inject_banners(elem,prefix){var n=Math.floor(Math.random()*banner_count);var banner=prefix+"static/banner_"+n+".jpg";var e=document.createElement("img");e.src=banner;e.id="nntpchan_banner";elem.appendChild(e);}
+/* ./contrib/js/dynamic-reply.js */
+
 /* ./contrib/js/expand-image.js */
 function filenameIsImage(fname){return/\.(gif|jpeg|jpg|png|webp)/.test(fname);}
 function setupInlineImage(thumb,url){if(thumb.inlineIsSetUp)return;thumb.inlineIsSetUp=true;var img=thumb.querySelector("img.thumbnail");var expanded=false;var oldurl=img.src;thumb.onclick=function(){if(expanded){img.setAttribute("class","thumbnail");img.src=oldurl;expanded=false;}else{img.setAttribute("class","expanded-thumbnail");img.src=url;expanded=true;}
diff --git a/contrib/templates/default/post.mustache b/contrib/templates/default/post.mustache
index 3435c61..7836bc5 100644
--- a/contrib/templates/default/post.mustache
+++ b/contrib/templates/default/post.mustache
@@ -14,7 +14,7 @@
     <span class="subject">{{post.Subject}}</span>
     <span class="name">{{post.Name}}</span>
     <time datetime="{{post.DateRFC}}">{{post.Date}}</time>
-    <a href="#" class="postnol">No.</a><a class="postno" onclick="nntpchan_backlink('{{post.ShortHash}}');" title="{{post.MessageID}}">{{post.ShortHash}}</a>
+    <a href="#" class="postnol">No.</a><a class="postno" onclick="nntpchan_reply('{{post.Prefix}}', this, '{{post.ShortHash}}');" title="{{post.MessageID}}" roothash="{{post.ReferenceHash}}" boardname="{{post.Board}}">{{post.ShortHash}}</a>
     <a href="{{post.PostURL}}">[{{#i18n.Translations}}{{reply_label}}{{/i18n.Translations}}]</a>
     <span class="tripcode">{{{post.Pubkey}}}</span>  
   </legend>
diff --git a/contrib/templates/default/postform.mustache b/contrib/templates/default/postform.mustache
index 64727d6..236a4c0 100644
--- a/contrib/templates/default/postform.mustache
+++ b/contrib/templates/default/postform.mustache
@@ -10,7 +10,7 @@
  }}
  <form action="{{post_url}}" enctype="multipart/form-data" name="post" method="post">
  {{{csrf}}}
- <input type="hidden" name="reference" value="{{reference}}" />
+ <input type="hidden" name="reference" value="{{reference}}" id="postform_reference"/>
  <div id="postform-outer">
    <div id="postform-inner">
      <table class="postform">