idShown = 0;

function showBlock (id)
{
	if(document.getElementById(idShown))
		document.getElementById(idShown).style.display='none';
	document.getElementById(id).style.display='block';
	idShown = id;
}

function SetIdShown(id)
{
	idShown = id;
}

function popup(katalog,plik)
{
	w=700;
	h=520;
	params='toolbar=no,location=no,directories=no,status=no,menubar=no,width='+w+',height='+h;
	params += 'scrollbars=no,resizable=no, top='+((screen.height/2) - h/2)+',left='+((screen.width/2) - w/2);

   pop = window.open("image_popup.php?katalog="+katalog+"&plik="+plik,"pop",params);
   pop.focus();
}