Cisco - ISA Server config help

I have the following scenario:

Internet <-->  (111.111.111.51)Cisco PIX (172.18.1.254)<--> (172.18.1.1)Microsoft ISA 2006 (10.1.0.205)<--> Internal Network <--> (10.1.0.222) Internal server to be published

My ISP has provided 6 public IP addresses for use.  I've already set up a Web server using port 80 that can be accessed and now I need to set up a second one.

I'm not clear about how the second one can be set up.  From what I'm reading in the PIX config, all traffic that comes in on the interface is sent to the ISA server.  I have an access list that controlls what ports will be allowed to pass through.  

At this time, I'm using the outside interface address as the destination address for those wishing to contact the internal server.  I'm guessing that I'll need to invoke one of the other IP addresses for this other server, but I can't see how to differentiate the two as they come in to the ISA server.

Basically, I have one internal web server working with this config, now I need to add another.

Here is my PIX config: (I changed the public IP's for security)

PIX Version 6.3(4)
interface ethernet0 auto
interface ethernet1 100full
nameif ethernet0 outside security0
nameif ethernet1 inside security100

fixup protocol dns maximum-length 512
fixup protocol ftp 21
fixup protocol h323 h225 1720
fixup protocol h323 ras 1718-1719
fixup protocol http 80
fixup protocol rsh 514
fixup protocol rtsp 554
fixup protocol sip 5060
fixup protocol sip udp 5060
fixup protocol skinny 2000
fixup protocol smtp 25
fixup protocol sqlnet 1521
fixup protocol tftp 69
names
access-list outside_access_in permit ip any interface outside
pager lines 24
mtu outside 1500
mtu inside 1500
ip address outside 111.111.111.51 255.255.255.248
ip address inside 172.18.1.254 255.255.0.0
ip audit info action alarm
ip audit attack action alarm
pdm location 172.18.1.1 255.255.255.255 inside
pdm location 10.0.0.0 255.0.0.0 inside
pdm location 172.18.0.0 255.255.0.0 inside
pdm logging informational 100
pdm history enable
arp timeout 14400
global (outside) 1 interface
nat (inside) 1 0.0.0.0 0.0.0.0 0 0
static (inside,outside) tcp interface https 172.18.1.1 https netmask 255.255.255.255 0 0
static (inside,outside) tcp interface www 172.18.1.1 www netmask 255.255.255.255 0 0
static (inside,outside) tcp interface 5080 172.18.1.1 5080 netmask 255.255.255.255 0 0
access-group outside_access_in in interface outside
route outside 0.0.0.0 0.0.0.0 111.111.111.49 1
timeout xlate 0:05:00
timeout conn 1:00:00 half-closed 0:10:00 udp 0:02:00 rpc 0:10:00 h225 1:00:00
timeout h323 0:05:00 mgcp 0:05:00 sip 0:30:00 sip_media 0:02:00
timeout uauth 0:05:00 absolute
aaa-server TACACS+ protocol tacacs+
aaa-server TACACS+ max-failed-attempts 3
aaa-server TACACS+ deadtime 10
aaa-server RADIUS protocol radius
aaa-server RADIUS max-failed-attempts 3
aaa-server RADIUS deadtime 10
aaa-server LOCAL protocol local
http server enable
http 172.18.0.0 255.255.0.0 inside
http 10.0.0.0 255.0.0.0 inside
no snmp-server location
no snmp-server contact
snmp-server community public
snmp-server enable traps
floodguard enable
telnet 10.0.0.0 255.0.0.0 inside
telnet 172.18.0.0 255.255.0.0 inside
telnet timeout 50
ssh timeout 5
management-access inside
console timeout 0
dhcpd address 172.18.1.255-172.18.2.30 inside
dhcpd lease 3600
dhcpd ping_timeout 750
dhcpd auto_config outside
terminal width 80
Cryptochecksum:a2d0f44120f5bf3ba828d0656999d8b8
: end
pixfirewall#

Thanks!
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