CSS Folder in the Application Folder

[eluser]sethkain[/eluser]
I have used CI for a year or so and have done a few installs before and everything has worked fine. But I have been tasked by my new employer to set CI up to where there are multiple applications in the Applications folder. That too has worked fine.

But I am stuck with how to locate the CSS folder with multiple applications.

I used a suggestion from this page to create an asset_url() variable.
http://heybigname.com/2009/11/23/managin...deigniter/

When I do that this is what I get:
<link rel="stylesheet" type="text/css" href="http://localhost/pso/application/pso/assets/css/pso_stylesheet.css" />

My directory is setup like this:
application
->pso
-->assets
--->css
->aim
system
www

I am at the point where I have looked at this too much and I can't see what I am doing wrong.
Any suggestions would help.
Hopefully I have provided enough information, if not let me know.
Thanks in advance.