Proxy Setting Not Applying

i have windows 2008 server r2 running ad , gpo. my computers being updated windows 7.  of computers win xp pro.  have ie 7 few have ie8.

 i created gpo setting proxy settings according posting found in forum (user\policy\windows\ie mtce\connection - enable proxy settings preferred setting).   policy did not apply.  checked server , applied correct ou.  realized have laptops created pac file use determine if users on network or not.  placed pac file in c:\windows folder on computer.  changed the internet connection options user automatice configuration script file://c:/windows/pxy.pac  believe script run every time open browser.  closed browser then opened it.   script is:

function findproxyforurl(url,host) {
if (
(isinnet(host,"142.141.147.0","255.255.255.128")) ||
(isinnet(host,"142.141.118.0","255.255.255.0")) ||
(dnsdomainis(host, ".nrcims.on.ca")) 
)
return "direct";
else

return "proxy 142.141.147.135:8081; direct"; }

it did not work.

so, here issue.  want apply simplest solution office network allow users use proxy while in office , not when out of office.  want transparent possible when travel don't have go in , add , remove proxy settings.

i have deleted , reenter proxy setting in gpo 4 times.  leaving on night apply user not apply.  script (above) to work through gpo or login script so there without having go each computer.

i have looked @ forum on ieak deployment and got me confused creating ins files , setting web site shares deploy script. 

hello sargie,

issue related scripting, suggest initiate new thread in our scripting forum better , accurate answer question. community members , support professionals there more familiar scripting , can resolve issue.

for convenience, have listed forum link below:
official scripting guys forum
http://social.technet.microsoft.com/forums/en-us/itcg/threads

proxy auto-config
http://en.wikipedia.org/wiki/proxy_auto-config

brent hu,

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Windows Server  >  Group Policy