Browsers trail

proxyAutoConfig-PAC.js

/*
Proxy Auto-Config file, see http://en.wikipedia.org/wiki/Proxy_auto-config
This would work with most browsers and more, do not need any heavy plugins with this script and it's more powerful, flexible and maintainable than 
any of plugins. Instead of clicking through menus, just point to this file anywhere in your FS.
*/
function FindProxyForURL(url, host) {
/* example with using regex:
var regexpr = /[a-zA-Z]{4}.microsoft.com/;
if(regexpr.test(host)) { ...
*/
  if ((host == "localhost") || (shExpMatch(host, "localhost.*")) || (host == "127.0.0.1")) { return "DIRECT"; }
  if (shExpMatch(host, "that*One*cluster.vip.acme.com")) {
      // do not use alerts with Opera, alerts here crash the browser
// alert("Going That clusters Proxy");
     return "PROXY that-clusters.vip.acme.com:1234";
  }
  // URLs within this network are accessed through
  else if (isInNet(myIpAddress(), "10.0.0.0", "255.255.248.0")) {
  // should this proxy fail to respond, go directly to the www:
      return "PROXY intranet-proxy.acme.com:12345; DIRECT";
  }
  else return "DIRECT";
}