diff --git a/js/captcha.js b/js/captcha.js
new file mode 100644
index 00000000..018588b7
--- /dev/null
+++ b/js/captcha.js
@@ -0,0 +1,43 @@
+var tout;
+
+function redo_events(provider, extra) {
+  $('.captcha .captcha_text, textarea[id="body"]').off("focus").one("focus", function() { actually_load_captcha(provider, extra); });
+}
+
+function actually_load_captcha(provider, extra) {
+  $('.captcha .captcha_text, textarea[id="body"]').off("focus");
+
+  if (tout !== undefined) {
+    clearTimeout(tout);
+  }
+
+  $.getJSON(provider, {mode: 'get', extra: extra}, function(json) {
+    $(".captcha .captcha_cookie").val(json.cookie);
+    $(".captcha .captcha_html").html(json.captchahtml);
+
+    setTimeout(function() {
+      redo_events(provider, extra);      
+    }, json.expires_in * 1000);
+  });
+}
+
+function load_captcha(provider, extra) {
+  $(function() {
+    $(".captcha>td").html("<input class='captcha_text' type='text' name='captcha_text' size='32' maxlength='6' autocomplete='off'>"+
+			  "<input class='captcha_cookie' name='captcha_cookie' type='hidden'>"+
+			  "<div class='captcha_html'></div>");
+
+    $("#quick-reply .captcha .captcha_text").prop("placeholder", _("Verification"));
+
+    $(".captcha .captcha_html").on("click", function() { actually_load_captcha(provider, extra); });
+    $(document).on("ajax_after_post",       function() { actually_load_captcha(provider, extra); });
+    redo_events(provider, extra);
+
+    $(window).on("quick-reply", function() {
+      redo_events(provider, extra);
+      $("#quick-reply .captcha .captcha_html").html($("form:not(#quick-reply) .captcha .captcha_html").html());
+      $("#quick-reply .captcha .captcha_cookie").val($("form:not(#quick-reply) .captcha .captcha_cookie").html());
+      $("#quick-reply .captcha .captcha_html").on("click", function() { actually_load_captcha(provider, extra); });
+    });
+  });
+}
\ No newline at end of file