function addfavorite()
{
   switch(getOs())
   {
       case 1:window.external.addFavorite('http://www.manmanzou.com','www.manmanzou.com');break;
       case 2:window.sidebar.addPanel('www.manmanzou.com', 'http://www.manmanzou.com', "");break;
       case 0:alert("您的浏览器也太牛了，我都不知道如何显示了。唉。");break;
   }
}
function getOs()
{
   if(navigator.userAgent.indexOf("MSIE")>0)return 1;
   if(isFirefox=navigator.userAgent.indexOf("Firefox")>0)return 2;
   if(isSafari=navigator.userAgent.indexOf("Safari")>0)return 3;   
   if(isCamino=navigator.userAgent.indexOf("Camino")>0)return 4;
   if(isMozilla=navigator.userAgent.indexOf("Gecko/")>0)return 5;
   return 0;
}