function setImgMargin(image_name)
		{
		    var img = document.images[image_name];
		    var cur_width = 780;
		    if (document.body.clientWidth > cur_width)
		        cur_width = document.body.clientWidth;
		    var margin = Math.round( cur_width * 0.25 - 197 );
		    img.style.marginLeft = margin;
		    return;
		}