$("#startDate").datepicker(
        { beforeShowDay: function(date) {
         var day = date.getDay();
         var date1 = date.getDate();
         var today = new Date();
         var difference = date - today;
         var daysDifference = Math.round(difference/(1000*60*60*24));
          if(daysDifference < 0) {
                 return [false]
         }else{
           return [true]
         }

          }
        });

    $( "#startDate").datepicker( "option", "dateFormat", "yy/mm/dd" );
    $( "#startDate" ).datepicker({ minDate: '+0m +0w +1d'});

$(".ui-datepicker-next ui-corner-all").removeAttr("title");
$(".ui-datepicker-prev ui-corner-all").removeAttr("title");

<a class="ui-datepicker-next ui-corner-all" onclick="DP_jQuery_1430805360315.datepicker._adjustDate('#startDate', +1, 'M');" tooltip="Next" tooltipenable="true">
<span class="ui-icon ui-icon-circle-triangle-e">Next</span>
</a>

$( "#startDate" ).datepicker( "option", "prevText", "" );
$( "#startDate" ).datepicker( "option", "nextText", "" );