tigressse

Below an example how to install a RTButton on Tumblr in 2 steps.

The RTbutton   has been designed by MicroPlaza.

You need to define this little piece of javascript before <div class=”post”>, it will configure the button to have the correct title and retweets count. You can also adapt it to change the leading part (ie: mp_leading = “RT @tigressse”) and if you want to keep the microplaza attribution (mp_attribution = true)

<script type="text/javascript">
  var t = document.createElement('p');
  t.innerHTML = "{Title}";
  mp_title = t.textContent;
  mp_permalink = "{Permalink}";
  mp_mode = "vertical";
  mp_leading = "RT @tigressse";
  mp_attribution = true;
</script>

Then you need to add this second piece of javascript where you want the button to appear (note that you can change the div style). A nice place to put the button is just before the title of the post, you add :

<div style="float: right;">
<script type="text/javascript" src="http://microplaza.com/r/button.js">
</script>
</div>

Thanks @tlg for his help.

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UPDATES

Since the Microplaza RTbutton no longer works, I find it useful to write a new post, better read this one Install a Retweet button on Tumblr (bis).