accessing base class variable

[eluser]mehwish[/eluser]
Actually form_controller is my default controller so whenever i call it , the controller index function will automatically be executed and fetch form values which a user will put which are user email and password (email1 is one of the variable which will hold the user form information) and obviously these variables I cannot place in class constructure otherwise how user information will be assigned to these two variables which i want to set ... hope you get my point what i am trying to ask .. plz suggest any idea if not the way which i am using i.e., globally set variables