function bookmark(url,title){
  if ((navigator.appName == "Microsoft Internet Explorer") && (parseInt(navigator.appVersion) >= 4)) {
  window.external.AddFavorite(url,title);
  } else if (navigator.appName == "Netscape") {
    window.sidebar.addPanel(title,url,"");
  } else {
    alert("Press CTRL-D (Netscape) or CTRL-T (Opera) to bookmark");
  }
}


function openCenterWindow(url, title, width, height) {
	var left = Math.ceil((window.screen.availWidth - width) / 2);
	var top  = Math.ceil((window.screen.availHeight - height) / 2);
	window.open(url, title, "menubar=no,status=no,scrollbars=yes,resizable=yes,width=" + width + ",height=" + height + ",top=" + top + ",left=" + left);
}