How to downgrade from gingerbread 2.3.3 to 2.2 froyo more details included

Hey i,m fairly new to all this flashing business and need some help so here goes.

i bought my galaxy s new originally it came with froyo 2.2 i believe can,t remember ever updating through kies software

here is details 

original factory shipped i believe.
apart from root done using super one click

firmware : 2.2

baseband I9000XXJPP

kernel : 2.6.32.9     root@sep-35 (hash) 1

build : FROYO.XXJPO

I then flashed DARKYROM 10.1 FINAL ( extreme edition)
 using odin 1.7 following this guide

http://www.darkyrom.com/community/index.php?threads/guide-final-v10-1-official-darkyrom-gingerbread-jvh-noob-friendly.3080/

using these files   
: Ficeto_Deodexed_JVH_I9000_ODIN
: Darkys_v10.1_Extreme_Edition

everything went fine with this

BUT.....

what i want to know is can i go back to the 2.2 froyo xxjpo i gave at top
and if so can i use odin to flash back to this as if i bought if new from shop
and if so how? if not what are other options i would really love to go back to original firmware.

any help appriecited

thank you

hello again as of an hour ago i have solved this problem i had, all i did was use odin 1.7
used 2 files :

s1_odin_20100512.pit

and

JPO_JPO_U_JPP       XXJPO FIRMWARE


I loaded pit file in pit

and firmware in PDA

i flashed and everything seems to have gone perfect i am now back to froyo 2.2 XXJPO

FIRMWARE : 2.2

BASEBAND: I9000XXJPP

KERNEL: 2.6.32.9
ROOT@SEP-35(HASH)1

BUILD : FROYO.XXJPO

Everything seems to be running as when i bought phone full internet connection full phone network connection everything seems ok had 1 little problem after flash android phone process kept coming up not responding had to force close FIXED this by going in recovery mode and doing factory reset no longer have this problem now all android market works and updates and flash works 2 . 

hope this helps anyone with same problem

can make a tutorial and post links and such if any help needed

And can anyone tell me if i have done anything incorrect when flashing back to this firmware, and anyone give me details to do complete flash using all 3 odin files modem csc pda phone etc

thank you again