I'm newer to jQuery UI and have downloaded the Blitzer theme for my company.  Perhaps I am not finding the info in the file or online, but why are there several CSS files with the theme, and are they all needed?  What does each one do?  I'm trying to minimize HTTP requests for faster page loading.  Thanks in advance.

 

jquery-ui.css (commented out)

jquery-ui-1.8.customBlitzer.css  (currently using this one)

ui.theme.css (commented out)