<center><script language="JavaScript">
function addFav(){
var url="endereço do seu blog";
var title="nome do seu blog";
if (window.sidebar) window.sidebar.addPanel(title, url,"");
else if(window.opera && window.print){
var mbm = document.createElement('a');
mbm.setAttribute('rel','sidebar');
mbm.setAttribute('href',url);
mbm.setAttribute('title',title);
mbm.click();
}
else if(document.all){window.external.AddFavorite(url, title);}
}
</script>
<a href="javascript:addFav()"><img border="0" alt="Adicione aos Favoritos"
src="http://i47.tinypic.com/257zwc2.jpg"/></a>
<a href="#" onclick="window.external.AddFavorite('endereço do blog','nome do blog');">
<img alt="Adicione aos Favoritos" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhoJ9NAFnNlglRQBs1MjZ2YEh4OSAyAQmabFPKMV0UPBQwHRqaeU7k0gJ1sYT6SA7ku2llcswsLzF3x1myd-dj89MLfm_cHyeDZI539aQ88u9ngV4V71J9zNS1jnkGDEnFbgkVVJo9lGOc-/s1600/images.jpg"
border="0"/> </a></center>
Basta trocar endereço do blog pelo link do seu site/blog
