I am not sure if this is possible, but can you browse from one non-concurrent subnet to another while being on the szame physical LAN (i.e. all workstations & servers are connected to the same hub)?
Example (hypothetical IPs):
2 ranges of IP addresses ... one being 18.104.22.168-255 (255.255.255.224) & the other being 22.214.171.124-95 (255.255.255.224). I want hosts browsing by NetBIOS name, the hosts on the other subnet for purposes of server shared resources. Each subnet has it's own gateway, configured as a router's internal ethernet port ... router connects to internet provider via ISDN. Provider hosts DNSs.