var ie4 = (document.all)? true:false;
var nc4 = (document.layers)? true:false;
if (!ie4) var nc6 = (document.getElementById)? true:false;

function schowaj(){
document.images['opis'].src='img/o_null.gif';
}

function pokaz(co){
document.images['opis'].src='img/o_'+co+'.gif';
}

function otworz(wy,sz,zaw,kol){
adres="photos.php?"+zaw+"&"+wy+"&"+sz+"&"+kol;
wy+=30;sz+=15;
zdj=window.open(adres,zaw,"toolbar=no,width="+sz+", height="+wy+", left=20, top=20");
}

function srodek_poz(layer,przes){
if(ie4||nc6){if(!sze) pol();d=W(layer);szel=d.width;
poz=parseInt(szel);poz=sze/2-poz/2;d.left=poz+przes;}}

function W(id){var d=document;d=d.getElementById?d.getElementById(id):d.all?d.all[id]:d.layers[id];
if(!document.layers)d=d.style;return d}
function pok(layer){d=W(layer);lay = layer;zezw=1;if (zezw){if(ie4||nc6) d.visibility = "visible";
if(nc4) d.visibility = "show";}}
function sch(layer){var layer;d=W(layer);zez=0;
if(ie4||nc6) d.visibility = "hidden";if(nc4) d.visibility = "hide";zezw=0;licz=0;}
function pol(){if(ie4){sze= document.body.clientWidth; wys= document.body.clientHeight; }if(nc4||nc6){sze = window.innerWidth; wys = window.innerHeight; }}