JQuery :: Load Specific Content From A Dynamic Page Into A Static One?

The original question was: does anybody know how to load a specific content and not an entire web page when using the jQuery.get below?

$.get('filename.html', function(data) {
$('.class_name').html(data);
});

and was given this code to use/try:

$.get('filename.html', function(data) {
$('.class_name',data).html(); //returns the HTML of .class_name inside of filename.html
});

but it didn't quite work. It loads the entire web page into the defined class name rather than loading a specific content (Look below for further understanding)The filename.html which has content tag names like "[Copyright Year] that goes in the footer position of the site gets dynamically generated.I've created another static page help.html that has pretty much the same content overall except the dynamic content won't get loaded with the content tag (the system doesn't allow static pages to load them). This is what brought me to this solution. So now that I've added a class name to the indicated class that I want to load it pulls all the content and styling of the site rather than just the dynamically generated content of (filename.html) .

<div class="adp_footer">[Copyright Footer]</div> <---- Doesn't get loaded when I used any of the above mention jquery strings,