Cisco PIX Port Fort Forwarding

I have the pix running on this network range

192.100.10.0 255.255.255.0

And my server which is on the network

192.200.10.0 255.255.255.0

And my servers IP: 192.200.10.11

I added these commands into the conf of the PIX

static (inside,outside) tcp interface 80 192.200.10.11 80 netmask 255.255.255.255
access-list outside-inbound permit tcp any host xx.xx.xx.20 eq 80

Where the xx.xx.xx.20 is my Pix's External IP

I cant seem to access the port from the outside. What am i doing Wrong?

From serverfault Shahmir Javaid

• I think 'interface' needs to be replaced with the external IP.

  Shahmir Javaid : That dont work for me it moans about the external interface being the same as the outside interface of the PIX
  From Chris Thorpe