var postcard_width = 244;
var postcard_height = 360;
var current = 0;
var count = 3;

function Postcard(path, imgsrc, title) {
	this.path = path;
	this.imgsrc = imgsrc;
	this.title = title;
}

function shiftLeft() {
	shift_images(-1);
	return true;
}

function shiftRight() {
	shift_images(1);
	return true;
}

function shift_images(dir) {
	current += dir;
	current = (current + count) % count;
	for (var i = 0; i < 3; ++i) {
		var a = $("#postcard_" + i);
		var img = a.find("img");
		var card = items[(current + i + count) % count];
		a[0].href = card.path;
		img[0].src = card.imgsrc;
		img[0].alt = card.title;
	}
}

$(document).ready(function() {
	$("#leftarrow").click(shiftLeft);
	$("#rightarrow").click(shiftRight);
});