var win = null;
function okno(mypage,w,h){
LeftPosition = (screen.width) ? (screen.width-w)/2 : 0;
TopPosition = (screen.height) ? (screen.height-h)/2 : 0;
settings ="height="+h+",width="+w+",top="+TopPosition+",left="+LeftPosition+",toolbar=no,location=no,directories=no,status=no,menubar=no,scrollbar=no,resizable=yes,copyhistory=yes";
win = window.open(mypage,"okno",settings);

}