function proportionalResize(imgname,maxwh,vertical)
	{
	var image = document.getElementsByName(imgname)[0];
	var h = image.height;
	var w = image.width;
	if (h > w)
		{
		image.style.height = maxwh + "px";
		image.style.width = Math.round((maxwh*w)/h) + "px";
		}
	if (w > h)
		{
		image.style.width = maxwh + "px";
		image.style.height = Math.round((maxwh*h)/w) + "px";
		if (vertical == "y") image.style.marginTop = ((maxwh-(Math.round((maxwh*h)/w)))/2) + "px"; //Vertical centering of the image in it's container
		}
	if (w == h)
		{
		image.style.width = maxwh + "px";
		image.style.height = maxwh + "px";
		}
	}