function showWindow(nazwa,myx,myy,zawartosc){
if(window.screen){
 aw=screen.availWidth;
 ah=screen.availHeight;
}else{
 aw=640;
 ah=450;
}
 ustawienia=
 "left=" + (aw-myx)/2 + ","
 +"top=" + (ah-myy)/2 + ","
 +"screenX=" + (aw-myx)/2 + ","
 +"screenY=" + (ah-myy)/2 + ","
 +"width=" + myx + ","
 +"height=" + myy + ","
 +"innerWidth=" + myx + ","
 +"innerHeight=" + myy + ","
 +"toolbar=no,"
 +"location=no,"
 +"directories=no,"
 +"status=no,"
 +"menubar=no,"
 +"scrollbars=yes,"
 +"resizable=yes";
myokno=open(zawartosc,nazwa,ustawienia);
myokno.focus();
return myokno
}