ok here is what u might have to do
1)boot into download mode(using 3 button combo-vol up+home+power,then select vol up to continue)
2)plug phone to pc once u r in download mode(there will be a huge android with the word downloading something something)
3)open up ODIN (make sure u have installed ADB drivers-install kies will solve this)
4)select PIT,PDA,PHONE(modem),CSC and follow the xda(dr.ketans guide)carefully b4 u hit the START button
5)wait till it finish flashing(should take about 7-10 mins)
6)phone will reboot-set ur phone then after that
7)boot into 3e recovery(stock recovery)
8)select update from sd card
9)look for the file(cwm.zip) which u already downloaded and transfer to ur phone
10)install cwm.zip
11)wait til cwm recovery boot(should take less than 1 minit)
12)select flash from internel/external sd
13)select su-busybox.zip
14)flash it then reboot phone this time it should boot up with "android is upgrading" wait til it finish boot up then u will have SU (means u r rooted)
good luck
