diff --git a/js/inline.js b/js/inline.js
new file mode 100644
index 00000000..1ce0edc3
--- /dev/null
+++ b/js/inline.js
@@ -0,0 +1,139 @@
+;(function() {
+  var App = {
+    cache: {},
+    get: function(url, cb) {
+      var $page = App.cache[url]
+      if ($page)
+        return cb($page)
+
+      $.get(url, function(data) {
+        var $page = $(data)
+        App.cache[url] = $page
+        cb($page)
+      })
+    },
+    options: {
+      add: function(key, description, tab) {
+        tab || (tab = 'general')
+
+        var checked = App.options.get(key)
+        var $el = $(
+          '<div>' +
+            '<label>' +
+              '<input type="checkbox">' +
+              description +
+            '</label>' +
+          '</div>')
+
+        $el
+          .find('input')
+          .prop('checked', checked)
+          .on('change', App.options.check(key))
+
+        window.Options.extend_tab(tab, $el)
+      },
+      get: function(key) {
+        if (localStorage[key])
+          return JSON.parse(localStorage[key])
+      },
+      check: function(key) {
+        return function(e) {
+          var val = this.checked
+          localStorage[key] = JSON.stringify(val)
+        }
+      }
+    }
+  }
+
+  var inline = function(e) {
+    e.preventDefault()
+
+    var $root = $(this).closest('.post')
+    var targetNum = this.textContent.slice(2)
+
+    var srcOP = $root.closest('[id^=thread]').attr('id').match(/\d+/)[0]
+
+    var node, targetOP
+    var isBacklink = !!this.className
+    if (isBacklink) {
+      node = $root.find('> .intro')
+      targetOP = srcOP
+    } else {
+      node = $(this)
+      targetOP = this.pathname.match(/(\d+).html/)[1]
+    }
+
+    var link = {
+      id: 'inline_' + targetNum,
+      isBacklink: isBacklink,
+      node: node
+    }
+
+    var selector = targetNum === targetOP
+      ? '#op_' + srcOP
+      : '#reply_' + targetNum
+
+    var $clone = $root.find('#inline_' + targetNum)
+    if ($clone.length) {
+      $clone.remove()
+      $(selector)
+        .show()
+        .next()
+        .show()
+      return
+    }
+
+    if (srcOP === targetOP) {
+      if (targetNum === targetOP)
+        link.node = link.node.next()// bypass `(OP)`
+
+      var $target = $(selector)
+      if ($target.length)
+        return add(link, $target)
+    }
+
+    var $loading = $('<div class="inline post">loading...</div>')
+      .attr('id', link.id)
+      .insertAfter(link.node)
+
+    App.get(this.pathname, function($page) {
+      $loading.remove()
+      var $target = $page.find(selector)
+      add(link, $target)
+    })
+  }
+
+  var add = function(link, $target) {
+    var $clone = $target.clone(true)
+
+    if (link.isBacklink && App.options.get('hidePost'))
+      $target
+        .hide()
+        .next()
+        .hide()
+
+    $clone.find('.inline').remove()
+    $clone.attr({
+      "class": 'inline post',
+      id: link.id,
+      style: null// XXX remove post hover styling
+    })
+    $clone.insertAfter(link.node)
+  }
+
+  App.options.add('hidePost', 'Hide inlined backlinked posts')
+
+  $('head').append(
+    '<style>' +
+      '.inline {' +
+        'border: 1px dashed black;' +
+        'white-space: normal;' +
+        'overflow: auto;' + // clearfix
+      '}' +
+    '</style>')
+
+  // don't attach to outbound links
+  $('.body a:not([rel]), .mentioned a')
+    .attr('onclick', null)// XXX disable highlightReply
+    .click(inline)
+})()