Block lightbox content

[JohnPalmer]

I'm working on a new website with aggregator of content.
i'll show to my users content from another website in my website in LIGHTBOX windows when they'll click on the title of the items.

** I don't have specific url for these items.
What is the best way to say for SE "Don't index these pages"?

[GPainter]

Do you mean other than use the no-index tag or blocking robots.txt ?

[JohnPalmer]

Yes,
Because I don't have specific URL for the lightbox. it's just a new way to show content...