Bypassing a poxy server

Hey experts,

I use the internt in my university (AUB - American University of Beirut). Of course, as a university they have around 8000 PCs, and therefore there are 4 proxy servers through which they connect to the internet. Internet Connection is broadband (and considered the best in the country), but the problem is that sometimes we need to use an application that needs to connect to the server directly (without using a proxy server) like a game or a download manager or an e-business application, and as a result we cannot connect to this application when we are using the internet inside our university. Is there a way that we can specify in the connection settings to bypass the proxy server (and thus to connect directly to our client PC).

I will provide you with the script that we use for the internet connection:

function FindProxyForURL(url, host)
{
        if (isPlainHostName(host) || dnsDomainIs(host, ".aub.edu.lb") || dnsDomainIs(host, ".intmed.aubmc.org.lb") )
            return "DIRECT";
        else if (isIpHost(host)) {
                if (isInNet(host, "192.168.0.0", "255.255.0.0") || isInNet(host, "193.188.129.0", "255.255.255.0")|| isInNet(host, "193.188.128.0", "255.255.255.0") || isInNet(host, "127.0.0.1", "255.255.255.0")) {
                        return "DIRECT";
                }
                else
                        return "PROXY proxya.aub.edu.lb:3128";
        }
        else
                        return "PROXY proxya.aub.edu.lb:3128";

}
function isIpHost(host){
        var MyQuad = host.split(".");
        if (MyQuad.length != 4){
                return false;
        }
        for (var i = 0; i < MyQuad.length; i++) {
                if (parseInt (MyQuad[i]) >= 0) {
                }
                else {
                        return false;
                }
        }
        return true;
}



P.S.: You wouldn't believe how solving this problem would help us a lot in our internet usage (we wouldn't get the "couldn't connect to server" annoying message), we would be able to use many many applications.