How to start oracle service on boot in linux

Hi ,

I have Oracle 10g with Netweaver 04s and i cant start the oracle serice automatic on boot. Every time i have to login to oraSID user and start listner with lnsnctl start and then login with sidadm and startsap all to start my sap but now i need to start it automatically can any one suggest how i can i do it

Regards,

Surya