function show(img, ext, width, height, city) {
	var isCity = city || false;

	var left = (screen.width - width) / 2;
	var top = (screen.height - height) / 2;
	opt = 'toolbar=no, menubar=no, width='+width+', height='+height+', scrollbars=no, location=no, titlebar=yes, directories=no, screenX='+top+', screenY='+left+', top='+top+', left='+left;
	loc = '/display.php?file='+img+'.'+ext;
	window.open(loc, "", opt);
}