That should be alright so long as the web servers real IP addresses are on the same subnet that the PIX inside address resides on. For instance, the following is ok:
ip address inside 10.1.1.254 255.255.255.0
static (inside, outside) 209.165.201.10 10.1.1.1 netmask 255.255.255.255
static (inside, outside) 209.165.201.11 10.1.1.2 netmask 255.255.255.255
static (inside, outside) 209.165.201.12 10.1.1.3 netmask 255.255.255.255
In this example, 10.1.1.0/24 is the internal LAN subnet and 209.165.201.x are the public IPs. Because the PIX and Web servers all have real addresses from the 10.1.1.0/24 subnet, the PIX can successfully route HTTP packets between the Internet and the Web servers without an itermediary router.
However the following will not work with just a PIX:
ip address inside 192.168.1.1 255.255.255.0
static (inside, outside) 209.165.201.10 10.1.1.1 netmask 255.255.255.255
static (inside, outside) 209.165.201.11 10.1.1.2 netmask 255.255.255.255
static (inside, outside) 209.165.201.12 10.1.1.3 netmask 255.255.255.255
Here the PIX resides on a different LAN subnet than the web servers and in this scenario you need a layer 3 router on the LAN. This router will then be able to route between 192.168.1.0/24 and 10.1.1.0/24 and this will allow HTTP traffic to flow between the Internet, PIX and Web servers.