var preloads = new Array("images/shadows/left.png", "images/shadows/right.png", "images/shadows/bottom_left.png", "images/shadows/bottom.png", "images/shadows/bottom_right.png")
var images = new Array();
var ajax = {connection: null, mode: "", queue: {mode: new Array(), data: new Array()}};
var couponFader = null;
var eListFader = null;
var popupId = 0;

for (var i = 0; i < preloads.length; i++) {
	images[i] = new Image();
	images[i].src = preloads[i];
}

function onLoad() {
	couponFader = new Fader(document.getElementById("coupon"), null, false, couponCancelled, 500);
	eListFader = new Fader(document.getElementById("elist"), null, false, eListCancelled, 500);
}

function createRequest() {
	var request = null;
	if (window.XMLHttpRequest)
		request = new XMLHttpRequest();
	else if (window.ActiveXObject) {
		try {
			request = new ActiveXObject("Msxml2.XMLHTTP");
		}
		catch(event) {
			try {
				request = new ActiveXObject("Microsoft.XMLHTTP");
			}
			catch(event) {
				return null;
			}
		}
	}
	else
		return null;
	return request;
}

function sendRequest(mode, data) {
	if (ajax.connection == null) {
		ajax.connection = createRequest();
		if (ajax.connection != null) {
			ajax.mode = mode;
			ajax.connection.onreadystatechange = dataReceived;
			ajax.connection.open("POST", "ajax.php");
			ajax.connection.setRequestHeader("Content-Type", "application/x-www-form-urlencoded");
			ajax.connection.send("md=" + mode + "&" + data);
		}
	}
	else {
		ajax.queue.mode[ajax.queue.mode.length] = mode;
		ajax.queue.data[ajax.queue.data.length] = data;
	}
}

function dataReceived() {
	if (ajax.connection.readyState == 4) {
		if (ajax.connection.responseText != null && ajax.connection.responseText != "") {
			switch (ajax.mode) {
				case "coupon":
					if (ajax.connection.responseText != "INVALID")
						location.href = ajax.connection.responseText;
					else
						document.getElementById("invalid").style.display = "inline";
					break;
				case "elist":
					if (ajax.connection.responseText == "INVALID_EMAIL")
						alert("Invalid email address.");
					else {
						if (ajax.connection.responseText == "SUBSCRIBE")
							alert("You have been sent a confirmation email, to complete subscription follow the instructions.");
						else if (ajax.connection.responseText == "UNSUBSCRIBE")
							alert("You have been sent a confirmation email, to complete unsubscription follow the instructions.");
						else if (ajax.connection.responseText == "PROCESSING")
							alert("You are already in the process of subscribing or unsubcribing.");
						else
							alert("Error");
						document.getElementById("elist").style.display = "none";
						document.getElementById("email").value = "";
						document.getElementById("email_ok").disabled = true;
					}
			}
		}
		ajax.connection = null;
		if (ajax.queue.mode.length > 0) {
			sendRequest(ajax.queue.mode[0], ajax.queue.data[0]);
			ajax.queue.mode.splice(0, 1);
			ajax.queue.data.splice(0, 1);
		}
	}
}

function fieldEmpty(field) {
	var node = document.getElementById(field);
	if (field == "code") {
		if (node.value == "")
			document.getElementById("invalid").style.display = "none";
	}
	document.getElementById(field + "_ok").disabled = (node.value == "");
}

function fieldKey(event, field) {
	if (!event.metaKey && (event.keyCode == 3 || event.keyCode == 13)) {
		if (field == "code")
			checkCode();
		else
			eList();
	}
}

function checkCode() {
	sendRequest("coupon", "code=" + document.getElementById("code").value);
}

function eList() {
	sendRequest("elist", "email=" + document.getElementById("email").value);
}

function couponCancelled() {
	var node = document.getElementById("coupon");
	if (node != null) {
		node.style.display = "none";
		node.style.opacity = 1;
		couponFader.now = 1;
	}
}

function eListCancelled() {
	var node = document.getElementById("elist");
	if (node != null) {
		node.style.display = "none";
		node.style.opacity = 1;
		eListFader.now = 1;
	}
}

function showPopup(url, width, height) {
	popupId += 1;
	eval("page" + popupId + " = window.open(url, '" + popupId + "', 'toolbar=0,scrollbars=1,location=0,statusbar=0,menubar=0,resizable=0,width=" + width + ",height=" + height + "');");
}