Check the screenshoot
its a newspapper website, so only allow the registed user to post comment to each note or news
see the attach,, when the user click on "Registrese aquí para participar" a javascrip popup shows up
showing the registration login form the the user do the log and automatic the popup disapear and load the note or news
any comments let me know..
the site is [url removed, login to view] take a look