Proxy autoconfig file could be used in browser (Opera,FireFox,IE) to change the proxy dynamically.
var ALLOWED = "DIRECT";
var DISALLOWED = "PROXY 0.0.0.0:1234";
function FindProxyForURL(url, host)
{
if (shExpMatch(url,"*.badsite.com/*")) {return DISALLOWED;}
var currentTime = new Date();// convert the current time to minutes
var now = 60*currentTime.getHours() + currentTime.getMinutes();
// Do not allow the access before 18:00
if (now < 18 * 60 ) {
return DISALLOWED ;
}
else
{
return ALLOWED ;
}
} // end of function