var NewWin = null;

function MakeNewWindow(a, w, h)
{
  var winl = (screen.width - w) / 2;
  var wint = (screen.height - h) / 2;

  var options="scrollbars=yes,resizable=no,toolbar=no,height="+h+",width="+w+",top="+wint+",left="+winl;
  NewWindow = window.open("",
			  "plan",
			  options);
  
  if(NewWindow.opener == null)
    {
      NewWindow.opener = self.top;
      NewWindow = window.open("plan");
    }
  
  if (parseInt(navigator.appVersion) >= 4) 
    { 
      NewWindow.window.focus(); 
    }
}