A GOOD and versatile news manager needed

[andyash]

How do I add Addthis or any other social networking code to a blog post? When I add the following to my template, it shows and works correctly on every page, but I want this to show only inside a blog post. How do I do that?

<script type="text/javascript" src="http://s7.addthis.com/js/250/addthis_widget.js#pubid=xa-4ebaaf262833ecbb"></script>