function popup(URL,szer,wys) 
{
if(window.screen) {
aw=screen.availwidth;
ah=screen.availheight;
}else{
aw=640;
ah=450;
}
ust=
"left="+(aw-350)/2+","
+"top="+(ah-200)/2+","
+"screenX="+(aw-350)/2+","
+"screenY="+(ah-200)/2+","
+"width="+szer+","
+"height="+wys+","
+"toolbar=no,"
+"location=no,"
+"directories=no,"
+"status=np,"
+"menubar=no,"
+"scrollbars=no,"
+"resizable=no";
nok=window.open(URL,'przeslij',ust);
nok.focus();
}