function getImgSize(imgSrc)
{
var newImg = new Image();
newImg.src = imgSrc;
var height = (newImg.height + 40);
var width = (newImg.width + 40);

var x_res = screen.width;
var y_res = screen.height;
var top = Math.round((y_res-height)/2);
var left = Math.round((x_res-width)/2);

//alert(width);

if(width>640) {
window.open(imgSrc,'bilde_jauna_loga', 'width='+width+', height='+height+', left='+left+', top='+top+',  toolbar=no,location=no,directories=no,status=no,menubar=no,scrollbars=yes,copyhistory=no,resizable=yes');
	}
}