function showImage(url) {
	var window_width = 520;
	var window_height = 520;
	var window_top = (screen.availHeight-window_height)/2-10;
	var window_left = (screen.availWidth-window_width)/2-5;
	nw = window.open('','view','width=' + window_width + ',height=' + window_height + ',top=' + window_top + ',left=' + window_left + ',features=toolbar=no,location=no,status=no,menubar=no,scrollbars=auto,resizable=no,maximize=no,minimize=no');
	if(!nw) nw = top;
	nw.location.href = url;
	return false;
}