var nav_img_left_off = new Image();
nav_img_left_off.src = "images/nav_left.png";

var nav_img_left_on = new Image();
nav_img_left_on.src = "images/nav_left-on.png";

var nav_img_right_off = new Image();
nav_img_right_off.src = "images/nav_right.png";

var nav_img_right_on = new Image();
nav_img_right_on.src = "images/nav_right-on.png";

function goUrl(url) {
    location.href = url;
}

function swapNav(element, direction) {
    if (direction == "on") {
        element.className = "on";
        element.childNodes[0].className = "on";
    }
    else {
        element.className = "off";
        element.childNodes[0].className = "off";
    }
}

function swapImg(element, swap_image) {
    document.getElementById(element).src = swap_image.src;
}

function clearMailingEmail(field) {
    if (field.value == "Type your Email here")
        field.value = "";
}

function showMailingThanks() {
    alert("Thank you for joining our maling list!");
}

function showLayer(layer) {
    document.getElementById(layer).style.display = "block";
}

function hideLayer(layer) {
    document.getElementById(layer).style.display = "none";
}

function sendJSONRequest(url, post_values, callback) {
    var wRequest = new Sys.Net.WebRequest();
    wRequest.set_url(url);
    wRequest.set_httpVerb("POST");
    wRequest.add_completed(callback);
    wRequest.get_headers()["Accept"] = "application/json";
    wRequest.get_headers()["Content-Type"] = "application/json"
    wRequest.set_body(post_values);
    wRequest.invoke();
}

function cleanJSON(string) {
    return string.substring(string.indexOf('{"d":"') + 6, string.lastIndexOf('"'));
}