Alternating master page templates in a non-facing pages document

Hi There,

I am creating a document without facing pages as they require bleed around the whole of each page. I am placing text into the document to generate the pages from the master pages. The problem is I have two master pages, left and right and I need them to flow left, right etc. How do I do this in a non-facing pages document? I'd really appreciate your help.

Thanks

Q