[liphp] session timeout problem

[Venkatagiriyappa, Veena]

Hi,
I am not very familiar with php session handling.  I was wondering how I
could write some
code that would end the session after a certain amount of time. Thus, if the
user leaves the window open by mistake, I don't have to worry about a
foreign user making changes. I have a table in my postgresql database for
the session. 
And how can I know if the page is active or inactive?(how to recognise the
page reload?). I really need this to work.
I am hoping to get a fast reply on this
Veena