[galaxy-dev] How disable browser forward and backward buttons from galaxy.

Hi, In galaxy after logout if i press browser back button, it takes me to my previous login page. For this , in our galaxy instance we modified welcome.html and templates/user/logout.mako and added the following java script: <script language="JavaScript"> javascript:window.history.forward(1); </script> still the browser back button works asusual. please suggest me where all pages i need to modify... -- Thanks & Regards, Hari Krishna .M