Video card questions

i want to know how to find out if my video card is built on the mother board or if it is by itself.

my computer is a dell dimension 2350 1.7 ghz processor 256 ddr ram and 30 gb hard drive.

i want to know if the following video card is compatible with my computer:

BFG Technologies Asylum GeForce FX 5600 256MB DDR AGP Graphics Card
Model: ASLM56256

this is where i found it:

http://www.bestbuy.com/site/olspage.jsp?id=1051826238335&skuId=5427488&type=product