Include remote .js-file in script-file (and use it's variables)

'm trying to access a remote .jsfile within an inDesign script to use it's variables. I found functions for including js-files locally but haven't found a good way to include.

http://remote-site.com/test.js:

var testVar = "it works!";

myscript.js, including locally (working):

app.doScript(new File("/Users/Popmouth/test.js")); alert(testVar);

myscript.js, including locally including remotely (not working):

app.doScript(new File("http://remote-site.com/test.js")); alert(testVar);

I also found this snippet, this alert works (alerts the content of the file, i.e. "var testVar = "it works!;") but I don't know how to use the vars in my alert function below:

var HTTPFile = function (url,port) {
          if (arguments.length == 1) {
                    url = arguments[0];
                    port = 80;
          };
          this.url = url;
          this.port = port;
          this.httpPrefix = this.url.match(/http:\/\//);
          this.domain = this.httpPrefix == null ? this.url.split("/")[0]+":"+this.port :this.url.split("/")[2]+":"+this.port;
          this.call = "GET "+ (this.httpPrefix == null ? "http://"+this.url : this.url)+" HTTP/1.0\r\nHost:" +(this.httpPrefix == null ? this.url.split("/")[0] :this.url.split("/")[2])+"\r\nConnection: close\r\n\r\n";
          this.reply = new String();
          this.conn = new Socket();
          this.conn.encoding = "binary";
          HTTPFile.prototype.getFile = function(f) {
                    var typeMatch = this.url.match(/(\.)(\w{3,4}\b)/g);
                    if (this.conn.open(this.domain,"binary")) {
                              this.conn.write(this.call);
                              this.reply = this.conn.read(9999999999);
                              this.conn.close();
                    } else {
                              this.reply = "";
                    }
                    return this.reply.substr(this.reply.indexOf("\r\n\r\n")+4);;
          };
}



var hyle = new HTTPFile("http://remote-site.com/test.js ");
alert(hyle.getFile());
hyle.getFile();