timeOut = 4000;

function slider(i, $ele){
  $.post('ajax.php', {
    nr : i
  }, function(data){
    $ele.append(data.html);
    $('.image_feature_block:first', $ele).animate({
      "margin-left": "-=160px"
    }, "slow", 'linear', function(){
      $(this).remove();
    });
     i = data.i;
     i++;
    window.setTimeout(function() {
      slider(i,$ele);
    }, timeOut);
  }, 'json');
}

$(document).ready(function(){
  $('.home_feature_list').load('ajax.php', '', function(){
    var $ele = $(this);
    window.setTimeout(function() {
      slider(4,$ele);
    }, timeOut);
  });
});