Displaying a message on the page after certain action

[eluser]wemago[/eluser]
if i get what you want, you can do it using
sessions flash messages, see latest updates on svn for CI.

Code:

if ( action fail )
       set flash msg
       redirect any where you want
   endif

on the location you want/redirect, you just need

Code:

if ( isset( flashmsg ) )
       print your message
    endif

and if you want it a bit more good looking just add a bit of javascript
fade out effect