VPN between Netscreen 5 and Netscreen 1000

I hope someone can help me out here.

I am trying to connect to my work LAN from my home pc over a cable 
Internet connection with a dynamic IP.  My home network is behind a 
Netscreen 5 and our LAN is behind a Netscreen 1000.
I can't establish a connection for the life of me.  Do I need a remote 
vpn client or can I just go straight through the NS5?
I have set up the VPN gateway, IKE and incoming and outgoing policies on 
the NS5 and 1000 but it still doesn't work.  Any suggestions? Hints? 
Documentation?
I really appreciate your input.

JW