[dba-Tech] Routing via two ADSL lines

Hi all

We have two ADSL lines at the office, one for normal data, one for the IP phones. Physically two different LANs, 192.168.1.0 and 192.168.2.0, both with subnet mask 255.255.255.0.
During night zero traffic runs at the ADSL line for the phones.

One workstation is running 24 hours and uploads a lot of data during the night to two remote IP addresses.
What would the easy way be to connect the two LANs and direct upload from the workstation to the outbound router at 192.168.2.1 while it is still connected to 192.168.1.0?

/gustav