3 Monitor Display

I just got a Dell Latitude D630 Laptop computer. I am currently working off of a desktop PC with dual monitors. I would like to hook up the two monitors (one Digital, one Analog) to my laptop docking station and have a 3 monitor display. If I hook up the two monitors to this computer with the current configuration, I am able to have a dual monitor display, but it will not allow me to use 3 monitors. I purchased a dual monitor video card for my desktop when I hooked up my monitors to the desktop (I say that because it may help me with the laptop configuration). Am I able to hookup the three monitors to the laptop without purchasing an expensive video card? or am I able to configure the computer in this manner at all?

You could always buy one of these:

http://www.iogear.com/main.php?loc [...] m=GUC2015V

Fry's carries them for about $80.

Should be sufficient for office work, but don't expect good video/gaming quality.

So, since I would hook my dell laptop into the docking station that has two ports on the back for two monitors, If I also put a video card in a USB port how is this different than just hooking up the two monitors to the two ports on the back of the docking station. How does this change the way the computer recognizes the monitors coming in.

The only thing I can think of is that when you hook in a monitor to one of the ports on the back of the docking station, it is the same video port that controls the monitor hooked to the laptop. So, therefore, hooking up a monitor to a usb port would be a different input. Am I on the right track?

Oh, I don't need any gaming quality. I just need it for normal office duties. I guess I will sell my other Invidia dual monitor video card that I have only had for a year.