function openWindow(url, width, height) {
	var left = (screen.width/2) - width/2;
	var top = (screen.height/2) - height/2;
	var styleStr = 'toolbar=no,location=no,directories=no,status=no,menubar=no,scrollbar=no,resizable=no,width=' + width + ',height=' + height + ',left=' + left + ',top=' + top + ',screenX=' + left + ',screenY=' + top;
	window.open(url, 'wind', styleStr);
}

function zoom(src, width, height) {
	openWindow('zoom.php?src=' + src + '&width=' + width + '&height=' + height, width, height);
}