So, here is the new method which will add exactly the same button, without adding any additional scripts to your blog.
In just two steps, you can have this button working on your blog:
STEP #1:
Log in to Blogger, go to Layout -> Edit HTML
And find (CTRL+F) this code in the template:
<div class='post-header-line-1'/>
STEP #2:
immediately below it, paste this code:
1: <!--ORKUT-SHARE-START-->
2: <b:if cond='data:blog.pageType == "item"'>
3: <a expr:href='"http://promote.orkut.com/preview?nt=orkut.com&du="
4: + data:post.url + "&tt=" + data:post.title' target='_blank'>
5: <img src='http://code.google.com/apis/orkut/docs/images/share.gif'/></a></b:if>
6: <!--ORKUT-SHARE-END-Help-http://whatjainsays.blogspot.com-->
You can use any image instead of the default Orkut-Share logo, like these:
DIRECT-LINK: http://i50.tinypic.com/14mz4ac.jpg
DIRECT-LINK: http://i47.tinypic.com/35bba5e.jpg
Save the widget.
To display this button, along with Twitter or Facebook buttons, use these tables:
Table to display ANY TWO BUTTONS at a time:
1: <table border="0">
2: <tr>
3: <td style="width:40%;">Paste Code For Orkut Here</td>
4: <td style="width:40%;">Paste Code For Twitter / Facebook Here</td>
5: </tr>
6: </table>
1: <table border="0">
2: <tr>
3: <td
4: style="width:25%;">Paste Code For Orkut Here</td>
5: <td
6: style="width:25%;">Paste Code For Twitter
7: Here</td>
8: <td style="width:25%;">Paste Code For Facebook
9: Here</td>
10: </tr>
11: </table>
Source: