Hi,
What is the network and subnet mask that you have configured on your netscreen remote client??
If you configured 192.168.1.0/24 then it will only route 192.168.1.0 network down the vpn. If you want to access other subnets then you need to do 192.168.0.0/16, this will send all 192.168.x.0 networks down the tunnel.
Remember you will also have to change the policy on the firewall to match the new subnet 192.168.0.0/16
Regards
Andy