Manually Create Proxy File

In many companies, we have to use proxy to connect to internet in that company needs to do the center control about web access, content filter etc.
So how to manually add your proxy settings together with the company proxy settings?
1, input the proxy setting address in the IE. In my case, I have input http://autocache.**.com, and a file download dialog will be prompted. Save this file as my.pac in C drive root. Of course you can put it in any place you want.
2, open this file with txt edit, for example notepad.

//Modified by Sai
if (shExpMatch(host, "*.blogspot.com"))
return "PROXY web-proxy.sgp.**.com:8080";
This means if the expression matches *.blogspot.com use your specified proxy.
3, open IE, in tools->Internet Options->Connections->LAN settings->check use automatic configuration script, input address file://c:/my.pac

That's it.