Index: redmine/trunk/app/helpers/projects_helper.rb
===================================================================
--- redmine/trunk/app/helpers/projects_helper.rb	(revision 3003)
+++ redmine/trunk/app/helpers/projects_helper.rb	(revision 3004)
@@ -53,13 +53,37 @@
 
   # Renders the projects index
   def render_project_hierarchy(projects)
-    render_project_nested_lists(projects) do |project|
-      s = link_to_project(project, {}, :class => "#{project.css_classes} #{User.current.member_of?(project) ? 'my-project' : nil}")
+    s_script = (
+      "<script language=\"javascript\">\n" +
+      "  function toggleDivGroup(el) {\n" +
+      "    var div = $(el).parents('div').first();\n" +
+      "    var n = div.next();\n" +
+      "    div.toggleClass('closed');\n" +
+      "    while (n.length && !n.hasClass('group')) {\n" +
+      "      n.toggle();\n" +
+      "      n = n.next('div');\n" +
+      "     }\n" +
+      "  }\n" +
+      "</script>\n"
+    ).html_safe
+
+    s_script << render_project_nested_lists(projects) do |project|
+      s = ''.html_safe
+      s << '<span class="expander" onclick="toggleDivGroup(this);">&nbsp;</span>&nbsp;'.html_safe unless project.leaf?
+
+      s << link_to_project(project, {}, :class => "#{project.css_classes} #{User.current.member_of?(project) ? 'my-project' : nil}")
       if project.description.present?
         s << content_tag('div', textilizable(project.short_description, :project => project), :class => 'wiki description')
       end
       s
     end
+
+    s_script
   end
 
   # Returns a set of options for a select field, grouped by project.