view multiple categories at once

Hi there,

For my particular set-up, I’d love to be able to give a link to view the posts from multiple categories or tags. For example, I want to show the posts categories 120 and 125 in chronological order on the same page: i.e. http://rossblog.com.au/?cat=120&125 or http://rossblog.com.au/?cat=120&cat=125 . Neither of those work of course, but…

Is there a way to do this?

Thanks!