function okno_fotogalerie(url)
{   w = 560;
	h = 490;
	left_vzd = (screen.width - w) / 2;
	top_vzd  = (screen.height - h) / 2;
 	vlastnosti = 'width=' + w + ',height=' + h + ', scrollbars=0,resizable=no, toolbar=no,location=no,directories=no,status=no,menubar=no,left=' + left_vzd + ', top='+top_vzd;
	window.open(url, 'fotogalerie', vlastnosti);	
}
function okno_volne()
{   
	w = 200;
	h = 150;
	left_vzd = (screen.width - w) / 2;
	top_vzd  = (screen.height - h) / 2;
 	vlastnosti = 'width=' + w + ',height=' + h + ', scrollbars=0,resizable=no, toolbar=no,location=no,directories=no,status=no,menubar=no,left=' + left_vzd + ', top='+top_vzd;
	window.open('/zima/ubytovani_volne.php', 'volne', vlastnosti);	
}