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<script type="text/javascript">
//Include your code below this line

//slide the arrow
                    var vibrate = function() {
                         $('#arrow').animate({
                              'background-position-x': '+=50'
                         }, 'fast').animate({
                              'background-position-x': '-=50'                             
                         }, 'fast');
                    };
                   
                    interval = setInterval(vibrate,50);
</script>