Yikes!  OK here is the bottom line on private address blocks.  You can use
private address anywhere inside your organization.  You can not use them at
all on the internet.  Here is why:  many routers on the internet have IP filters
and routing filters that prevent private IP traffic to be passed.  Routing 
filters won't allow the knowledge of an advertised 10.x.x.x address to propogate
throughout the internet.  Check out rfc1918 and rfc2050 (the accepable IP addr
use policy).

If you do use private IP address on the internet, you're playing with fire.
Things may work, but not always.

Check out rfc2050 for the reason why we use private IP addresses.  These net
blocks were basically the ones that the old ARPAnet used.  Hope this helps!

	Mike