Ads links should be nofollow

In the Google Webmaster Guidelines (http://support.google.com/webmasters/bin/answer.py?hl=en&answer=66356) is recommended that advertising links shouldn't pass PageRank.

You can achieve this by setting the link to 'nofollow'.

If you enter

$link_attributes['attributes']['rel'] = 'nofollow';

in functions simpleads_preprocess_simpleads_img_element and simpleads_preprocess_simpleads_text_element the job is done.