That's a very nice jquery plugin, unfortunately you are unlikely to find anything more than what is already on that page you linked to.
The page is clearly intimidating to a rails new be.
I think what you have to do is to create a new rails application using this command:
rails new calendar -m https://github.com/lleger/Rails-3-jQuery/raw/master/jquery.rb
Assume you were in the directory /home/richlewis14 when you issued that command, so now you'd have a new directory
/home/richlewis14/calendar
That directory contains a rails application that uses that plugin, but before that new rails app will run, you have to get the actual plugin, by issuing this command
wget http://arshaw.com/fullcalendar/downloads/fullcalendar-1.5.zip
That will download the plugin into some directory on your computer, let's assume it downloaded into
/home/richlewis14/downloads/fullcalendar=1.5.zip
And you unzip the file and the actual plugin code ends up in
/home/richlewis14/downloads/fullcalendar-1.5
the next set of instructions tell you how to move the plugin code into into /home/richlewis14/calendar
mv /home/richlewis14/downloads/fullcalendar-1.5/jquery/jquery-ui-1.8.9.custom.min.js /home/richlewis14/calendar/public/javascripts/
mv /home/richlewis14/downloads/fullcalendar-1.5/demos /home/richlewis14/calendar/public/
mv /home/richlewis14/downloads/fullcalendar-1.5/fullcalendar/*.css /home/richlewis14/calendar/public/stylesheets/
See if you can get that far, and I'l help with the next set of instructions regarding jquert.REST plugin
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