Remove the 'Page Expiry' Popup on the public page.

We have a a  WebCenter Portal application(WebCenter 11.1.1.8).  When a user invokes a page and remains idle for some time, they see the standard expiry popup dialog box containing the message: 'Page Expired. The page has expired. Click OK  to continue.'  I added the following entries in web.xml in war file, but there is not effect.   <context-param>  <param-name>javax.faces.STATE_SAVING_METHOD</param-name>  <param-value>client</param-value>  </context-param>   <context-param>  <param-name>oracle.adf.view.rich.sessionHandling.WARNING_BEFORE_TIMEOUT</param-name>  <param-value>-1</param-value>  </context-param>