Código HTML:
<script type='text/javascript'> //<![CDATA[ $(document).ready(function (){ setInterval(function animar(){ $('.animar').children('.front').stop().animate({ "left" : "500px"}, 6000,function() { $('.animar').children('.front').stop().animate({ "left" : "0px"}, 6000) }); },1000); } ); //]] </script>