custom build download css js problem

custom build download css js problem

i am trying to download a custom version of jqm to save some file size. i have two questions

(1) css files
i got 2 css files,  structure and theme.
the theme file seems to be smaller. what do i need?
do i need both or just one of them? the download page says i will have a full and a structure css file.
and this sounds like the theme file is the full file, but it is smaller. so far, neither worked for me.

(2) js file
what do i need to include? i just want to exclude table, tab, panel, flipswitch. do i need everything in the core section?

thanks for any help.