multiple monitors - pls help!

I have recently bought a Dell computer with video card "128MB PCI Express ATI Radeon X300 SE" (dual mode with 2 conectors, one for VGA, the other for DVI)

I would like to link 2 - 4 monitors with the computer, how should I do it?

I have contact Dell and ATI, but none of them give me a satisfied answer, probably I am not a computer guy, and don't know what they are talking about.

Pls help me.

Many thanks.