function popUp(page, name, scroll, resize) {
  page = page.split(" ").join("%20");
  var h = screen.height / 2;
  var w = screen.width / 2;
  var winl = (screen.width - w) / 2;
  var wint = (screen.height - h) / 2;
  winprop  = 'height='+h+',width='+w+',top='+wint+',left='+winl+',scrollbars='+scroll+',resizable='+ resize+'';
  win = window.open(page, name, winprop);
  if (parseInt(navigator.appVersion) >= 4) win.window.focus();
}