var win = null;
  function Nwin(mypage,myname,w,h){
  LeftPosition = (screen.width) ? (screen.width)/4 : 0;
  TopPosition = 30;
  settings =
  'width='+w+',height='+h+',top='+TopPosition+',left='+LeftPosition+',scrollbars=yes,resizable'
  win = window.open(mypage,myname,settings)
  if(win.window.focus){win.window.focus();}
  }