The question was to find the hidden flag in their webpage (http://tasks.2014.volgactf.ru:28101/)
Note: [Server is down so cannot fetch the exact question.Sorry about that]
I really have no clue about web challenges as i am not the guy at all.But i know the basics.Hence as a challenge with blank mind i just looked at the login page
Looking at it ,its evident that its something about phpsessionid.Well before this i had seen a comment in html source page saying help.php..so i loaded http://tasks.2014.volgactf.ru:28101/help.php and saw this:
FLAG : Easy_task_on_Session_Fixation.