How to make a 'like' button for each post without going on permalink page? I mean, even in the homepage, which script can I use to have something like the heart on this page? (mouseover the photos, there's a heart to like the post)
From the page, they're using the javascript:
$('a.like-link').click(function() {
var post = $(this).closest('.post');
var id = post.attr('id');
var oath = post.attr('rel').slice(-8);
var like = 'http://www.tumblr.com/like/'+oath+'?id='+id;
$('#likeit').attr('src', like);
}
So post is just the HTML element of the post, they then simply get the id of that post and the 8 char code needed to like or reblog a post. They take all this, throw it into a URL and set it to the source of an iFrame on the page (#likeit)