Site to Site vpn config example ASA 8.4 or newer.

Just copy paste.
Mirror this config on the other side.

crypto ikev1 enable outside
crypto ikev1 policy 10
authentication pre-share
encryption 3des
hash md5
group 2
lifetime 86400
!
object network OBJ-SiteA
subnet 10.0.0.0 255.255.255.0
object network OBJ-SiteB
subnet 10.0.3.0 255.255.255.0
!
access-list VPN-TRAFIC extended permit ip object OBJ-SiteA object OBJ-SiteB
nat (inside,outside) source static OBJ-SiteA OBJ-SiteA destination static OBJ-SiteB OBJ-SiteB no-proxy-arp route-lookup
!
tunnel-group 200.200.200.200 type ipsec-l2l
tunnel-group 200.200.200.200 ipsec-attributes
pre-shared-key cisco123
isakmp keepalive threshold 10 retry 2 (Optional)
!
crypto ipsec ikev1 transform-set VPN-TRANSFORM esp-3des esp-md5-hmac
!
crypto map CRYPTO-MAP 1 match address VPN-TRAFIC
crypto map CRYPTO-MAP 1 set pfs group2 (Optional)
crypto map CRYPTO-MAP 1 set peer 200.200.200.200
crypto map CRYPTO-MAP 1 set ikev1 transform-set VPN-TRANSFORM
crypto map CRYPTO-MAP interface outside



Related Article :

http://www.petenetlive.com/KB/Article/0000050.htm