urgently : login system

[eluser]7amza[/eluser]
Helllo ,
i had tested all auth's libraries .but, any once work fine with my needs .
so , i decided to make the login system manually . but, when i try to use the session library it lose the informations fastly ! and cookie i don't now how i can work with it !
the table of admins is : admins
1 field : adminid
2 field : adminame
3 field : adminpass
4 field : adminemail
if you can help do this task i well be very grateful to you .
Hamza