[amy2203]

That's just using dialog.tpl to place the page content in. Take a look around your templates and you'll see that you can use the dialog style box anywhere. If I remember correctly at this time of night you need to put your content inside tags like this,

{capture}

content here

{/capture ....dialog}

There should be something else in the end capture tag, but it's something like that. All you need to do is add this to your template for your category pages - I can't remember what they are but use webmaster mode to help you find them.

hth