diff --git a/wrap/python/ajax/Makefile.am b/wrap/python/ajax/Makefile.am
index 48aad3e39..d881b3921 100644
--- a/wrap/python/ajax/Makefile.am
+++ b/wrap/python/ajax/Makefile.am
@@ -23,8 +23,9 @@
 nodist_noinst_SCRIPTS = spot.py
 EXTRA_DIST = $(srcdir)/spot.in README ltl2tgba.html css/ltl2tgba.css	\
   css/tipTip.css js/jquery.tipTip.minified.js js/jquery.ba-bbq.min.js	\
-  logos/lip6sys64.png logos/lrde64.png logos/spot64s.png		\
-  logos/mail.png css/ui-lightness/jquery-ui-1.8.13.custom.css		\
+  js/jquery.ba-dotimeout.min.js logos/lip6sys64.png logos/lrde64.png	\
+  logos/spot64s.png logos/mail.png					\
+  css/ui-lightness/jquery-ui-1.8.13.custom.css				\
   css/ui-lightness/images/ui-icons_222222_256x240.png			\
   css/ui-lightness/images/ui-bg_glass_100_f6f6f6_1x400.png		\
   css/ui-lightness/images/ui-bg_glass_100_fdf5ce_1x400.png		\
diff --git a/wrap/python/ajax/css/loading.gif b/wrap/python/ajax/css/loading.gif
new file mode 100644
index 000000000..e15844396
Binary files /dev/null and b/wrap/python/ajax/css/loading.gif differ
diff --git a/wrap/python/ajax/css/ltl2tgba.css b/wrap/python/ajax/css/ltl2tgba.css
index 471053d56..28b3038b2 100644
--- a/wrap/python/ajax/css/ltl2tgba.css
+++ b/wrap/python/ajax/css/ltl2tgba.css
@@ -119,6 +119,12 @@ table.ltltable
     color: red;
 }
 
+.ltl2tgba .loading {
+    display: block;
+    margin: 0 auto;
+    text-align: center;
+}
+
 .ltl2tgba .neverclaim, .ltl2tgba .accrun {
     font-family: monospace;
     white-space: pre;
diff --git a/wrap/python/ajax/js/jquery.ba-dotimeout.min.js b/wrap/python/ajax/js/jquery.ba-dotimeout.min.js
new file mode 100644
index 000000000..02d9349c2
--- /dev/null
+++ b/wrap/python/ajax/js/jquery.ba-dotimeout.min.js
@@ -0,0 +1,9 @@
+/*
+ * jQuery doTimeout: Like setTimeout, but better! - v1.0 - 3/3/2010
+ * http://benalman.com/projects/jquery-dotimeout-plugin/
+ * 
+ * Copyright (c) 2010 "Cowboy" Ben Alman
+ * Dual licensed under the MIT and GPL licenses.
+ * http://benalman.com/about/license/
+ */
+(function($){var a={},c="doTimeout",d=Array.prototype.slice;$[c]=function(){return b.apply(window,[0].concat(d.call(arguments)))};$.fn[c]=function(){var f=d.call(arguments),e=b.apply(this,[c+f[0]].concat(f));return typeof f[0]==="number"||typeof f[1]==="number"?this:e};function b(l){var m=this,h,k={},g=l?$.fn:$,n=arguments,i=4,f=n[1],j=n[2],p=n[3];if(typeof f!=="string"){i--;f=l=0;j=n[1];p=n[2]}if(l){h=m.eq(0);h.data(l,k=h.data(l)||{})}else{if(f){k=a[f]||(a[f]={})}}k.id&&clearTimeout(k.id);delete k.id;function e(){if(l){h.removeData(l)}else{if(f){delete a[f]}}}function o(){k.id=setTimeout(function(){k.fn()},j)}if(p){k.fn=function(q){if(typeof p==="string"){p=g[p]}p.apply(m,d.call(n,i))===true&&!q?o():e()};o()}else{if(k.fn){j===undefined?e():k.fn(j===false);return true}else{e()}}}})(jQuery);
\ No newline at end of file
diff --git a/wrap/python/ajax/ltl2tgba.html b/wrap/python/ajax/ltl2tgba.html
index 26fdbb24e..ed87a94da 100644
--- a/wrap/python/ajax/ltl2tgba.html
+++ b/wrap/python/ajax/ltl2tgba.html
@@ -12,6 +12,7 @@
     <script type="text/javascript" src="http://ajax.googleapis.com/ajax/libs/jqueryui/1.8.13/jquery-ui.min.js"></script>
     <script type="text/javascript" src="js/jquery.tipTip.minified.js"></script>
     <script type="text/javascript" src="js/jquery.ba-bbq.min.js"></script>
+    <script type="text/javascript" src="js/jquery.ba-dotimeout.min.js"></script>
     <script type="text/javascript">
     jQuery(document).ready(function(){
         $.spotvars = { autoupdate: false,
@@ -156,11 +157,13 @@
                 .addClass("ui-icon-circle-arrow-s");
             ui.siblings('[class!="dontcollapse"]').hide('fast', callback);
         }
-        function unfold(ui) {
+        function unfold(ui, noshowsiblings) {
             var icon = ui.children(".ui-icon");
             icon.removeClass("ui-icon-circle-arrow-s")
                 .addClass("ui-icon-circle-arrow-n");
-            ui.siblings('[class!="dontcollapse"]').show('fast');
+            if (!noshowsiblings) {
+              ui.siblings('[class!="dontcollapse"]').show('fast');
+            }
         }
 
         function foldToggle(ui) {
@@ -185,6 +188,14 @@
         }
 
         function updateResults() {
+            // If the answer takes more that 200ms to arrive,
+            // display a busy indicator.
+	    $.doTimeout('res-update', 200, function(){
+              $("#results-body").hide();
+              $("#results-loading").show();
+              $("#results").show();
+              unfold($("#results-head"), true);
+            })
 	    // don't read window.location.hash, because
 	    // it has been %-decoded by firefox, which
 	    // cause problems when formulae include '&'.
@@ -193,13 +204,16 @@
 		.load("/cgi-bin/spot.py",
                       fragment,
                       function(response, status, xhr) {
+			  $.doTimeout('res-update');
 			  if (status == "error") {
 			      var msg = "Sorry but there was an error: ";
 			      $("#results-body").html(msg + xhr.status + " "
 						      + xhr.statusText);
 			  }
+			  $("#results-loading").hide();
+			  $("#results-body").show();
 			  $("#results").show();
-			  unfold($("#results-head"));
+			  unfold($("#results-head"), true);
 			  fold($("#ltl-head"), function() {
 			    if ($.spotvars.scrolldown)
 			      $('html,body').animate({scrollTop: $("#results-head").offset().top}, 'slow');
@@ -610,7 +624,9 @@ an identifier: <span class="formula">aUb</span> is an atomic proposition, unlike
       </FORM>
 	  <div id="results" class="ui-widget ui-widget-content ui-corner-all collapsible shadow">
 	    <h3 id="results-head" class="ui-widget-header ui-corner-all head">Results<span class="ui-icon ui-icon-circle-arrow-n restip">Fold</span></h3>
+	    <div id="results-loading" class="dontcollapse"><img src="css/loading.gif" class="loading" border=0 alt="loading..."></div>
 	    <div id="results-body">
+	      Loading...
 	    </div>
 	  </div>
     </div>
diff --git a/wrap/python/ajax/spot.in b/wrap/python/ajax/spot.in
index 3af5fe4e5..1199ebd96 100755
--- a/wrap/python/ajax/spot.in
+++ b/wrap/python/ajax/spot.in
@@ -215,7 +215,7 @@ import buddy
 def alarm_handler(signum, frame):
     unbufprint("""<p><font color="red">The script was aborted because
 it has been running for too long.</font>  Please try a shorter formula,
-or different options (not drawing automata usually helps).
+or different options.
 If you want to benchmark big formulae it is
 better to install Spot on your own computer.</p>\n""")
     finish(kill = True)