I'm very new to Rails (and web) programming, so I'm not even sure what technology I should be looking for for this.

I've downloaded and run through the first five chapters of the Rails tutorial, but now have a very simple request.

On the left hand side of a web page, I will have a table. If the user clicks on an element in that table, I want to have the right hand side of the page show something new.

I already have a page to display the table, viz:

<div class="center hero-unit">
   <div class="container">
   <h2>2012 Yearly Report</h2>
     <div class="row-fluid">
       <div class="span12">
           <div class="span4">
            <table border="1">
            </table>
           </div>
           <div class="span6">
                <!-- load stuff here based on what someone clicks on in the table -->
           </div>
         </div>
      </div>
   </div>
</div>

And I'm using bootstrap layouts to display everything. I just don't understand how to change the contents of the 'span6' div based on user behavior in 'span4'.