var images = [  '/default/img/main/logo1.jpg',
 '/default/img/main/logo2.jpg' ];
var offset = 0;
$('#image').attr('src', images[offset]);
var interval = 3;
setInterval(function() {
  $('#image').fadeOut(800, function() {
    $('#image').attr('src', images[offset]);
  }).fadeIn(800); 
  if(offset === images.length - 1) offset = 0;
  else offset++;
}, interval * 1000);