function open_window($url,$name,$w,$h,$scroll)
{
  var $l = (screen.width - $w) / 2;
  var $t = (screen.height - $h) / 2;
	var $scr = $scroll ? 'yes' : 'no';

  window.open($url,$name,'copyhistory=no,scrollbars='+$scr+',width='+$w+',height='+$h+',left='+$l+',top='+$t);
}

function image_show($id,$w,$h)
{
	open_window('popup_image.php?id='+$id,'image',$w + 10,$h + 10,false);
}

function swap_image($id,$w,$h)
{
	document.getElementById('thumb').src = 'image.php?id='+($id + 1);

	$big_id = $id;
	$big_w = $w;
	$big_h = $h;
}

function show_big()
{
	var img = document.getElementById('thumb');
	if ($big_id) image_show($big_id,$big_w,$big_h);
}

function poptavka($id)
{
	open_window('popup_poptavka.php?id='+$id,'poptavka',450,300,false);
}