Its an old method of using odin. It is in Chinese and I can't change the language. If anyone can help, please help.
Connect your phone to pc in usb debugging.
Use odin 3.07
add the i9300i-cwm-recovery-126.96.36.199-cn.tar to PDA and press start
after then copy the CWM_Root_4.3_For_Samsung.zip to phone and in recovery mode flash the zip.
Its all, you have a rooted device now.
Some users are worried about unrooting the device. If want so just download this file and odin it, here you are again unroot.
One user says that his net is not working, I don't think so. just once format(factory reset) your phone, your problem will be solved and device will remain rooted.