function getContent(url, callback) {
    var request = new Sys.Net.WebRequest();
    request.set_url(url);
    request.set_httpVerb("GET");
    var del = Function.createCallback(getContentResults, callback);
    request.add_completed(del);
    request.invoke();
}

function getContentResults(executor, eventArgs, callback) {
    if (executor.get_responseAvailable()) {
        callback(eval("(" + executor.get_responseData() + ")"));
    }
    else {
        if (executor.get_timedOut())
            alert("Timed Out");
        else if (executor.get_aborted())
            alert("Aborted");
    }
}