Does anyone the what the color scheme is for the 02 sensors in the 2000?

This pics shows http://ahsan.fotopic.net/p6875085.html
and http://ahsan.fotopic.net/p6875086.html the BLUE, RED, WHITE, and GREEN.

I think the BLUE and RED are front but which is bank 1 and 2?
Same with the WHITE and GREEN, are they the back set and if so which is bank 1 vs 2?

I am just guessing about the above so if anyone knows for sure please let me know cause I needa change Rear bank 1.
Thanks.

 

I just changed my rear bank 2 which is after the cat. and that is the white one. got it at autozone for 85.00 had to order it.You can always just follow the o2 back

 

This is from the nissan factory service manual:

O2 sensor 1 bank1= white bank2=red

O2 sensor 2 bank1= black bank2=blue

 

O2 SENSOR, BLUE (B1, S2)
$122.55

 

Bank 1 Firewall Side
Bank 2 Radiator Side