Help adding Tweet Button to Wordpress

OK I am trying to add the Twitter Button to my Wordpress Blog which is here:

http://www.chrislowthian.co.uk

The code I am using is this:

<a href="http://twitter.com/share" rel="nofollow" class="twitter-share-button" data-url="<?php the_permalink() ?>" data-count="vertical" data-via="chrislowthian">Tweet</a><script type="text/javascript" src="http://platform.twitter.com/widgets.js"></script>

Code (markup):

I have added the code to the following pages:

- index.php
- single.php
- archive.php

The tweet button now shows up on the post pages, the homepage and the category pages.

The problem is the tweet button only tweets the correct url and page title when you click on it on the post pages.

When clicking it on one of the category pages or index page it just tweets the current page url and title and not the posts details that it is next to.

Anyone know what I should change the code to for it to work on category and index pages?

Thanks

 

All fixed now was missing the following:

data-text="<?php the_title(); ?>"

Code (markup):

 

To enable the button on your blog please visit the “Appearance > Extras” menu and select the “Show a Twitter Tweet Button on my posts” option.

 

@appstacks I think the "Appearance > Extras" menu is not wordpress default

 

That is for Wordpress.com Users, my blog is Self Hosted.

 

i have checked your blog, the problem was solved, right?!

 

Yes Thank You all sorted now