var scaleImage = function(o, w, h) {
	var img = new Image();
	img.src = o.src;
	if (img.width > 0 && img.height > 0) {
		if (img.width / img.height >= w / h) {
			if (img.width > w) {
				o.width = w;
				o.height = (img.height * w) / img.width;
			} else {
				o.width = img.width;
				o.height = img.height;
			}
			o.alt = img.width + "x" + img.height;
		} else {
			if (img.height > h) {
				o.height = h;
				o.width = (img.width * h) / img.height;
			} else {
				o.width = img.width;
				o.height = img.height;
			}
			o.alt = img.width + "x" + img.height;
		}
	}
}