Importing css into Robohelp

I'm trying to import my own css into Robohelp so that we don't have to manually edit every single document we already have. I was told that the way to do it was to add the following to the <head> tag/paragraph.

<style type="text/css" media="all">@import "OurOwn.css";</style>

This assumes, of course, that our css file is called "OurOwn.css". The request is completely ignored and the generated code shows no signs of our css. If, however, I manually edit documents and add the following to the <head> paragraph:

<link rel=StyleSheet href="..\OurOwn.css">

It works fine. Any ideas? Suggestions?

Thanks, and take care out there.