well i've been making enough money in poker that out of nothing better to do im going to make a dual monitor setup. any of you have any experience with this?

i currently have a samsung 193p (19" lcd) and its plugged into my dvi slot.
i plan on buying a samsung 21" lcd and plugging that into the analog slot. would this work as a dual monitor setup? just one vid card with 2 monitors plugged into it?

if not, would i have to purchase another vid card? fyi i have a 256mb geforce card, not sure on exact model, its 5xxx.

thanks