You have to do a few things for this to work (and you may still get mixed results given the layering of the CSS).
1. In the index.html file of the RPM site you need to add the class "showgrid" to the container <div>. It should look like this:
<div id="wrap" class="container showgrid">
2. You're now going to get a page error because the browser is looking for grid.png.
3. This file is located in the blueprint/src directory. You can either move this to stylesheets/src or modify the screen.css file to point to the original location.
This should get the grid displaying, but you may need to mess with the CSS file in order to get things looking right.
If you're on a Mac, I'd suggest you take a look at Slammer (http://site.ringce.c...er/slammer.html
). It's a standalone app that puts a flexible grid on your screen and can be used with any application, including the browser.
Hope this helps!