$(document).ready(function(){  
        var content = $('#corpo');  
  
        //pre carregando o gif  
        loading = new Image(); loading.src = 'loader.gif';  
        $('#menu a').live('click', function( e ){  
            e.preventDefault();  
            content.html( '<img src="loader.gif" />' );  
  
            var href = $( this ).attr('href');  
            $.ajax({  
                url: href,  
                success: function( response ){  
                    //forçando o parser  
                    var data = $( '<div>'+response+'</div>' ).find('#corpo').html();  
  
                    //apenas atrasando a troca, para mostrarmos o loading  
                    window.setTimeout( function(){  
                        content.fadeOut('slow', function(){  
                            content.html( data ).fadeIn();  
                        });  
                     }, 0 );                  }  
                  });    
			   });  
			});