Can you please tell me why
this works (by appending "foo" to the image caption):

1.     $(document).ready( function() {
           $('#main_content div img').attr('title','foo');
           $('#main_content div .caption').append($('#main_content div img').attr('title'));
       });
   
   
   
   

but this doesn't

1.     $(document).ready( function() {
           $('#main_content div .caption').append($('#main_content div img').attr('title'));
       });
   
   
   

I wanted it to append the contents of the title attribute to the caption, so I'd know that my selectors were working.