I'm trying to run a site on a MAMP stack, but when I load a page the assets aren't showing up. I inspected the Net tab in Firebug, and my stylesheet tags are pointing to the right CSS files, but the browser is returning a 404 error on each one. I'm almost positive this is a file permissions deal (i.e. user and group). I'm using Mac 10.5, Apache 2.2, and PHP 5.3. Is this a PHP or an apache issue? How do I determine what users/groups to change my asset files to?