Stopping update checks while logging into gui

Hi,
I am using openSUSE 11.0. Each time i boot the system or log into the gui, the software updates list keeps getting refreshed. This consumes about 4-5 Mb, which is not desirable for me. How do i stop this regular checkup?
The settings are for updates to be checked once a week and nothing to be installed automatically. Are these settings different for root and user as i can change these preferences as user itself.

Samrat,

Yast, Software, Software repositories: Uncheck “Autorefresh” for all sources.

Uwe

Thank you !