Always search from the root page.

templates/base.html

@@ -41,7 +41,7 @@
     {% endif %}
 
     <div>
-      <form action="{{ relative_root | safe }}{{ page.url }}" method="get">
+      <form action="{{ relative_root | safe }}" method="get">
         <script type="text/javascript">
             var EmptySearchFieldDone = 0;
             function EmptySearchField(elem) {