Plugin for displaying ads in LiveStreet CMS 2.1.0

Requires a plugin or other solution for LiveStreet CMS 2.1.0 that
would allow ad units to be displayed automatically in the body of the article.

For example:
1st block after 5 paragraphs
2nd block after 20 paragraphs
3rd block after 35 paragraphs
4th block after 50 paragraphs
etc.