How to boot from Flash (If containing 2 Images)

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Hi,

If I had 2 different IOS versions in the flash, how would you chose to boot from one over the other? (call them 1 & 2)
If booting from 1 and then I save the config. Would the same config be used if booting from IOS2?

fsanyee

boot system flash I]flash-fs[/I][COLOR=Black][B]:[/B][/COLOR I]partition-number[/I][COLOR=Black][B]:[/B][/COLOR I]filename[/I

alxx

From my 3640 config


boot system flash:c3640-telco-mz.124-23.bin


!
version 12.4
service timestamps debug uptime
service timestamps log uptime
no service password-encryption
no service dhcp
!
hostname R8
!
boot-start-marker
boot system flash:c3640-telco-mz.124-23.bin
boot-end-marker
!

enable secret 5 $blahblahblah.
!
no aaa new-model
!
!
ip cef
!
!
!
!
!
!
!
interface FastEthernet0/0
ip address 192.168.1.201 255.255.255.0
duplex auto
speed auto
!
interface FastEthernet2/0
no ip address
shutdown
duplex auto
speed auto
!
interface FastEthernet2/1
no ip address
shutdown
duplex auto
speed auto
!
no ip http server
ip forward-protocol nd
!
!
!
!
!
control-plane
!
!
line con 0
speed 9600
line aux 0
line vty 0 4
login
!
end