function TweakImage(img, w, h) {
	if (typeof w != undefined) {
		var origWidth = img.width;
		if (img.width > w) {
			img.width = w;
			if (typeof h != 'undefined') {
				img.height = h;
			} else if (origWidth > 0) {
				var scale = (origWidth / w);
				// img.height = img.height * scale;
			}
		}
	}
}