function openWindow(url, windowname, width, height) {
  var left = (screen.width - width) / 2;
  var top = (screen.height - height) / 2;

  winprops = 'height='+height+',width='+width+',top='+top+',left='+left+',scrollbars=no,resizable=no';
  win = window.open(url, windowname, winprops);
  win.focus();
}

function showMiniHelp(infotext) {
  var width = 470;
  var height = 220;

  var left = (screen.width - width) / 2;
  var top = (screen.height - height) / 2;

  winprops = 'height='+height+',width='+width+',top='+top+',left='+left+',scrollbars=no,resizable=no';
  win = window.open('minihelp.php?infotext='+infotext, 'minihelp', winprops);
//  win = window.open('minihelp.php?infotext='+encodeURI(infotext), 'minihelp', winprops);

  win.focus();
}