增加收藏兼容主流浏览器代码

//增加收藏
function AddFavorite(){
	if (document.all) {
	addToBookMark(window.location.href, document.title);
	} else if (window.sidebar) {
	addToBookMark(document.title, window.location.href);
	}
}

function addToBookMark(url,title){
 var ua = navigator.userAgent.toLowerCase();
 if(ua.indexOf("msie 8")>-1){
  	external.AddToFavoritesBar(url,title);//IE8
  }else{
  try {
  	window.external.addFavorite(url, title);
  } catch(e) {
	  try {
			window.sidebar.addPanel(title, url);//firefox
		  } catch(e) {
			alert("增加收藏失败，请使用Ctrl+D进行增加");
		  }
	  }
  }
  return false;

   
}