var shopWindowCheckTimeout = 5000;
var shopWindowOpen = false;
var shopWindowHref = null;

function buy(catNum) {
	openShopWindow(catNum);
}

function openShopWindow(catNum) {
	var width, height;
	
	if (screen && screen.width > 760) {
		width = 760;
		height = 400;
	}
	else {
		width = 560;
		height = 300;
	}
	
	shopWindowHref = "http://shop.aprrecordings.co.uk/shop/order/add.asp?shop=apr&product=" + catNum
	shopWindow = open(
		shopWindowHref,
		"shop",
		"left=10,top=70,width=" + width + ",height=" + height + "," +
		"menubar=1,resizable=1,scrollbars=1,location=0,status=1"
	);
		
	if (shopWindow && shopWindow.focus) {
		shopWindow.focus();
	}
	
	//setTimeout('checkShopWindow();', shopWindowCheckTimeout);
}

function checkShopWindow() {
	if (!shopWindowOpen) {
		var answer = window.confirm(
			"The APR shopping cart pop-up window has not appeared.\n" +
			"This may be because you are running a pop-up blocker.\n\n" +
			"Open the shopping cart in the main window?"
		);
		if (answer) window.top.main.location.href = shopWindowHref;
	}
	shopWindowOpen = false;
}