I'm trying to set-up a preschool class with 3 IP cameras that will
allow parents to remotely view their kids from any pc on the web. 
These are video streaming cameras with MPEG-4 video that have
integrated webservers.  I'm planning on using a PoE switch like the
Netgear ProSafe FS108P.  I have been told that for bandwidth and
access reason I should get a static IP account from my ISP.
My question-If I just want use 1 static IP address from the ISP, I'm
not sure what I need for hardware to translate  (NAT?) to the
seperate IP camera addresses.  Can someone recommend specific
(hopefully inexpensive) equipment that would enable this.  If there is
a better way then I would like to hear that too.

Sorry this is my first question so I have no idea what price to set.  Here goes.

Thanks.

you should be able to set the ip address up on your router. You can
set each camera to have a static or for the router to automatically
assign one. I guess it all depends on how the camera software works.

You don't need static IP addresses from your ISP for the cameras, but
you will need a router (if you don't already have one) and that will
need a static IP address. The static IP address from the ISP is the
one that the outside world will use to connect. On the router you need
to configure something called "Port forwarding" or "Server
Publication" or "Virtual server" depending on your router. The switch
will connect to the router and the internal devices to the switch.

Your camera (and PCs if you have them as well) IP addresses will be
"NAT" addresses in a private subnet, 192.168.xxx.xxx where you can
configure the last two bytes. You set the internal address on the
router and on the devices to be from the same subnet, for example:
router - 192.168.10.1
camera 1 - 192.168.10.2
camera 2 - 192.168.10.3
camera 3 - 192.168.10.4

The subnet mask is 255.255.255.0 and the default gateway is the
internal router address. Set up the port forwarding on the router so
that for each camera a unique TCP port on the external (static) IP
address is forwarded to port 80 on that camera. For example,
TCP port 10000 --> 192.168.10.2 port 80
TCP port 10001 --> 192.168.10.3 port 80
TCP port 10002 --> 192.168.10.4 port 80

When your parents want to connect, they specify the external IP
address and the port, for example 66.24.33.192:10000 in their browser.

You may find this site useful:
http://www.portforward.com/english/routers/port_forwarding/routerindex.htm