var aktiv="no";
var nn="no";
var ns="no";
var adv1="";
var adv2="";
var adv3="";
var vers="";
if (navigator.appName == "Netscape" && (navigator.appVersion.substring(0,3) >= 3.0))
nn="yes";
if (navigator.appName == "Microsoft Internet Explorer" && (navigator.appVersion.substring(0,3) >= 4.0))
nn="yes";

if(nn=="yes")
{
but1u = new Image();
but1u.src = "i/historia.gif";
but2u = new Image();
but2u.src = "i/jam.gif";
but3u = new Image();
but3u.src = "i/chihua.gif";
but4u = new Image();
but4u.src = "i/szcze.gif";
but5u = new Image();
but5u.src = "i/wystaw.gif";
but6u = new Image();
but6u.src = "i/galeria.gif";
but7u = new Image();
but7u.src = "i/ciekaw.gif";
but8u = new Image();
but8u.src = "i/kontakt.gif";
but9u = new Image();
but9u.src = "i/linki.gif";
but10u = new Image();
but10u.src = "i/papillony.gif";

but1d = new Image();
but1d.src = "i/historia2.gif";
but2d = new Image();
but2d.src = "i/jam2.gif";
but3d = new Image();
but3d.src = "i/chihua1.gif";
but4d = new Image();
but4d.src = "i/szcze2.gif";
but5d = new Image();
but5d.src = "i/wystaw2.gif";
but6d = new Image();
but6d.src = "i/galeria2.gif";
but7d = new Image();
but7d.src = "i/ciekaw2.gif";
but8d = new Image();
but8d.src = "i/kontakt2.gif";
but9d = new Image();
but9d.src = "i/linki2.gif";
but10d = new Image();
but10d.src = "i/papillony1.gif";


}
function down(file)
{ 
if (nn=="yes")
{ 
id = eval(file + "d.src");
document [file].src = id;
};
if(aktiv!="no")
{
iu = eval(aktiv + "u.src");
document [aktiv].src =iu;
};
};
function up(file)
{ 
if (nn=="yes")
{ 
iu = eval(file + "u.src");
document [file].src = iu;};
if(aktiv==file)
{
iu = eval(file + "d.src");
document [file].src = iu;
};
};