I call the js files for bootstrap twitter library but I get the error that indicates

$(a[rel=popover]).popover is not a function

.

<script src=../../jq/jquery-1.7.1.min.js type=text/javascript></script>

<script src=../../bootstrap/js/bootstrap.js type=text/javascript></script>

<script src=../../bootstrap/js/bootstrap-tooltip.js type=text/javascript></script>

<script src=../../bootstrap/js/bootstrap-popover.js type=text/javascript></script>



<script type=text/javascript>

    $(document).ready(function () {



        // second supervisor popover

        $('a[rel=popover]').popover({

            placement: 'below',

            offset: 20,

            trigger: 'manual'

        });

    });





</script>