I am using codeigniter 1.7.2.In my web app after logging out, on clicking the back button of the browser the page is reloaded in the logged in page. This issue is occuring on Opera and Safari only.I have disabled cache using meta, but that doesn't help. 
\[code\]<meta http-equiv="PRAGMA" content="NO-STORE" /><meta http-equiv="Expires" content="-1" /><meta http-equiv="CACHE-CONTROL" content="NO-STORE" />\[/code\]Please help..
\[code\]<meta http-equiv="PRAGMA" content="NO-STORE" /><meta http-equiv="Expires" content="-1" /><meta http-equiv="CACHE-CONTROL" content="NO-STORE" />\[/code\]Please help..