How to - Lightbox / Greybox / Popup

Hello All,

I know enough about Joomla and FlexiContent to be dangerous to my own site, and I am easily confused, so go easy on me :mrgreen:

I have set up a category that will display a list of items that have a file attached (in a custom field), but I am lost on how to make that file appear in a popup window.

For example, when a user clicks on the file (PDF, Word Document, etc) my browser offers to either save the file or open it. This works ok, but I would rather have a PDF file open directly on the screen (which is how my docman files work)

This category has the potential to house many different file types, but I would like the PDF's only to open in a popup window.

Any guidance on what plugin/module I need to install and how to configure would be greatly appreciated.

Thanks!