$.ajax({
	url: target_file,
  	beforeSend: function(){
	// triggered before the ajax-call is made
	}
}).done(function(data){
	// triggered when ajax-call is done, the loaded file is stored in data-variable
	// load specific element (content) from the data into specific element (container):
	$("#container_element").html($(data).find('#content_element'));
}).fail(function(){
	// triggered when error during ajax-call
}).always(function(){
	// always triggered, no matter if success or fail
});