function popWin(url, w, h)
{
	var ww = w;
	var hh = h;
	origLeft = (screen.width-ww)/2;
	origTop = (screen.height-hh)/2;
	var w = window.open("",
                       "map",
                       "resizable=yes,status=0,scrollbars=0,menubar=0,directories=0,width=" + w + ",height=" + h);
   if (w)
   {
		w.location=url;
		w.moveTo(origLeft,origTop);
		w.focus();
   }
}