Get Friday of current week

HTML

<script src="//ajax.googleapis.com/ajax/libs/jqueryui/1.11.2/jquery-ui.min.js"></script>
<link rel="stylesheet" href="//ajax.googleapis.com/ajax/libs/jqueryui/1.11.2/themes/smoothness/jquery-ui.css">
<input type="text" name="dateInput" id="datepicker"/>

JavaScript

$(function() {
    $( "#datepicker" ).datepicker({
        showWeek: true,
        firstDay: 1,
        onSelect: function(date){
         var d = new Date(date);
            var index = d.getDay();
            if(index == 0) {
             d.setDate(d.getDate() - 2);
            }
            else if(index == 6) {
             d.setDate(d.getDate()-1);
            }
            else if(index != 5 && index > 0) {
              d.setDate(d.getDate() - (index - 5));
            }
            $(this).val(d);
        }

    });
});