CMS Made Simple Forums

Hi, I tried installing prettyURLs on a site hosted on Yahoo Small Business hosting.  I normally use Dreamhost, and everything works fine, but on this host, the pages don't show up when the prettyURLs are implemented.  Any ideas on what to do?  I'm just using the standard prettyURLs installation from the installation guide, which normally works fine.

I just realized that Yahoo hosting doesn't accept .htaccess files.  That must be the problem.  Oh well.