function Zopen(okno,foto,szer,wys)
{
location.reload();
if(navigator.appName == "Microsoft Internet Explorer")
{
szr = parseInt(szer/2)
ws = parseInt(wys/2)
wdx = parseInt(document.body.offsetWidth/2)
wdy = parseInt(screen.height/2)
}
else if(navigator.appName == "Opera" || navigator.appName == "Netscape" )
{
szr = parseInt(szer/2)
ws =  parseInt(wys/2)
wdx = parseInt(screen.width/2)
wdy = parseInt(screen.height/2)

}
dx = wdx - szr;
dy = wdy - ws;

Z=window.open(okno+"?idfoto="+foto+"","W","toolbar=0,location=0,directories=0,status=0,menubar=0,top="+dy+",left="+dx+",screenX="+dx+",screenY="+dy+",scrollbars=auto,resizable=no,width="+szer+",height="+wys);

Z.focus();
}