function centerImages(classname, maxDimension)
{
	var images = getElementsByClass(classname);
	for (var i = 0; i < images.length; i++)
	{
		var imgHeight = images[i].height;
		var imgWidth = images[i].width;
		var HWratio = imgHeight / imgWidth;
		var WHratio = imgWidth / imgHeight;
		if (imgHeight == imgWidth)
		{
			images[i].width = maxDimension;
			images[i].height = maxDimension;
		}
		if (imgHeight < imgWidth)
		{
			images[i].width = maxDimension;
			var offset = (maxDimension - images[i].height) / 2;
			images[i].style.marginTop = offset + "px";
		}
		if (imgHeight > imgWidth)
		{
			images[i].width = maxDimension / HWratio;
			var offset = (maxDimension - images[i].width) / 2;
			images[i].style.marginLeft = offset + "px";
		}
	}
}