--- a/web/views/tabs.py	Tue Nov 29 11:18:46 2011 +0100
+++ b/web/views/tabs.py	Tue Nov 29 12:06:35 2011 +0100
@@ -61,7 +61,7 @@
             tabid, xml_escape(self._cw.build_url('json', **urlparams))))
         if show_spinbox:
             # Don't use ``alt`` since image is a *visual* helper for ajax
-            w(u'<img src="%s" id="%s-hole"/>'
+            w(u'<img src="%s" alt="" id="%s-hole"/>'
               % (xml_escape(self._cw.data_url('loading.gif')), tabid))
         else:
             w(u'<div id="%s-hole"></div>' % tabid)