Insert something every nth row in Views

Most likely you will want to insert an ADD, probably adsense add every nth row in views. To do that there are 3 methods. One of them is a module a guy made that acts as global filed you add and then you enter what goes in there, problem is that JS code doesnt work there as it is html only field, so some custom formatters should be added. 2 other methods are more straightforward, you just edit the template file and add code there every nth row or you make a view override and on creation of view add a line of code, it can be a node or something else. Here is the list of them with links

http://www.pedroposada.com/blog/insert-whatever-every-nth-row-views.htm… views module
https://www.drupal.org/node/536830 template override
http://drupal.stackexchange.com/questions/10319/insert-row-into-a-view view code override