mimesweeper for web proxy.pac question

[swabs]

Hello,

I have a problem with our Proxy.pac file. We currently have a local copy of a proxy.pac file in each remote office. Each local file redirects most requests to a server(named PROXYWEB) in our main office. The script is very simple:

function FindProxyForURL (url, host)
{
else
if (isInNet(myIpAddress(), "192.168.235.0", "255.255.255.0")) return "PROXY PROXYWEB:80";

else
return "DIRECT";

This works great if the connection to the main office is functioning. However if the link fails users in each office can't browse the web because their browser is searching for PROXYWEB which is not available. Is there a command I can enter to tell the script to use "DIRECT" if PROXYWEB is not reachable?