Setting up dual external monitors on docked E6410

I have an E6410 with Nvidia card. I am docked with a single external monitor connected to the only VGA port on the docking station. Currently, I have expanded my desktop to use the laptop screen in combination with the external monitor. I would like to replace the laptop monitor by bringing in another large LCD external monitor. How do I accomplish this?

The docking station has the following video interfaces: