Auto Refresh a function in controller

[eluser]hema[/eluser]
Hi All,

I am having two different sites with single database. In site1, people will start commenting on one article written by author. Now in the site 2 that author should get automatic update on the comment without refreshing his page. And refresh time should not be more time, it will be better if update happens as soon as people comments are done.

Can anyone suggest me how to achieve this either with ajax or any plugin already available for updating controller every second without refreshing page.