Index: lib/redmine.rb
===================================================================
--- lib/redmine.rb	(revision 1354)
+++ lib/redmine.rb	(working copy)
@@ -97,7 +97,7 @@
   menu.push :my_page, { :controller => 'my', :action => 'page' }, :html => { :class => 'mypage' }, :if => Proc.new { User.current.logged? }
   menu.push :projects, { :controller => 'projects', :action => 'index' }, :caption => :label_project_plural, :html => { :class => 'projects' }
   menu.push :administration, { :controller => 'admin', :action => 'index' }, :html => { :class => 'admin' }, :if => Proc.new { User.current.admin? }
-  menu.push :help, Redmine::Info.help_url, :html => { :class => 'help' }
+  menu.push :help, Redmine::Info.help_url, :html => { :class => 'help', :target => '_blank'}
 end
 
 Redmine::MenuManager.map :account_menu do |menu|
