JQuery Error: Is not a function

/*Transcendent Date Selector - chrisstormer.com DEMO Scripts for running the date range picker within the article page*/
    $(document).ready(function() {  enhancedDomReady(function(){
            $('.toggleRPpos').click(function(){
                if($('div.rangePicker').css('float') == 'left') {
                    $('div.rangePicker').css('float', 'right');
                    $('.toggleRPpos').html('Align date picker to the left');
                }
                else {
                    $('div.rangePicker').css('float', 'left');
                    $('.toggleRPpos').html('Align date picker to the right');
                }
                return false;
            });

            // create date picker by replacing out the inputs
        $('.rangePicker').html('<a href="#" class="range_prev"><span>Previous</span></a><a href="#" class="rangeDisplay"><span>Pick a Date</span></a><a href="#" class="range_next"><span>Next</span></a>').dateRangePicker({menuSet: 'pastRange'});

        });
        });