popups or lightbox?

I have pages that include links to other sites – and I’d like them to show in ‘pop-ups’ so the visitor doesn’t get directed away from my site. I have a page called “Press” and it lists articles about our project that have appeared in the news. Each one is a hyperlink to the article – but – I don’t want readers leaving my site so want to have the article appear in a pop-up. I’m very new at WordPress so ALL help will be appreciated. THANKS