function ImgResizeHeight(imgid)
{
	// constants 
	var maxw = 192;
	var maxh = 128;

	// get the object
	var obj = document.getElementById(imgid);

	// calculate sizes
	var x = obj.width;
	var y = obj.height;
	var ratio = x/y;
	if (x>maxw)
	{
		x = maxw;
		y = maxw/ratio;
	}
	if (y>maxh)
	{
		y = maxh;
		x = maxh*ratio;
	}

	// set sizes
	obj.height = y;
	obj.width  = x;
}