function popup(href) {
	var newImage = new Image();
	newImage.onload = function () {
		getHeightWidth( this, href )
	};
	newImage.src = href;
	getHeightWidth( newImage, href );
}

function getHeightWidth( newImage, href ) {
	if (newImage.alreadyLoaded || newImage.width == 0)
		return true;
	breite = newImage.width;
	hoehe = newImage.height;
	newImage.alreadyLoaded = true;
	var scroll = 'no';
	var new_breite = breite;
	var new_hoehe = hoehe;
	if (breite > 960) {
		scroll = 'yes';
		new_breite = 960;
	}
	if (hoehe > 800) {
		scroll = 'yes';
		new_hoehe = 800;
	}
	
	var NewWin = window.open('popup.php?bild='+href+'&w='+breite+'&h='+hoehe,'NewWin','toolbar=no,location=no,directories=no,statusbar=no,menubar=no,scrollbars='+scroll+',resizable=yes,copyhistory=no,width='+new_breite+',height='+new_hoehe);
}