Site to site VPN between 2x ASA 5505 (8.4) not working

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http://serverfault.com – I have 2 cisco asa's 5505 running 8.42. All is working fine (using NAT), but I cant get a site to site VPN to work. I used the wizard in the ASDM all with default settings (except for the peer adresses / PSK / local/remote networks off course). When I send a ping to the other ASA, the tunnel wont come up. I found some posts on the internet mentioning that a NAT exempt has to be made, so I checked the box for this in the asdm wizard (using the option "inside" for it). Still no results. Please help : Saved : ASA Version 8.4(2) ! names <<NOT NEEDED>> ! interface Ethernet0/0 switc ()