<!--

function openCentered(url, w, h, wname) { 
  var left = (screen.width-w)/2;
  var top = (screen.height-h)/2;
  wpopup = window.open(url, wname, "height="+h+",width="+w+",toolbar=no,resizable=1,status=no,screenx="+left+",screeny="+top+",left="+left+",top="+top+"");
}

//-->