Probably basic 3-monitor setup question

[A_Junglen]

Hello,

I currently have a Dell XPS210 computer, which has a video card with 2 ports. I plug my Dell 2001FP and Dell 2007WFP into it to use dual monitors.

It is my intent to add the Dell 3007WFP (30in) to my setup, making my setup look something like this:



Now, the XPS210 really isn't upgradeable (There isn't an open AGP/PCI slot to add in an additional video card. Is there accessory I can use to make this happen?