$(document).ready(function(){

                //how much items per page to show
                var show_per_page = 24;
                //getting the amount of elements inside content div
                var number_of_items = $('#content').children().size();
                //calculate the number of pages we are going to have
                var number_of_pages = Math.ceil(number_of_items/show_per_page);

                //set the value of our hidden input fields
                $('#current_page').val(0);
                $('#show_per_page').val(show_per_page);

                //now when we got all we need for the navigation let's make it '

                /*
                what are we going to have in the navigation?
                - link to previous page
                - links to specific pages
                - link to next page
                 */
                var navigation_html = '<a class="previous_link pagess" href="javascript:previous();">Prev</a>';
                var current_link = 0;
                while(number_of_pages > current_link){
                    navigation_html += '<a class="page_link pagess" href="javascript:go_to_page(' + current_link +')" longdesc="' + current_link +'">'+ (current_link + 1) +'</a>';
                    current_link++;
                }
                navigation_html += '<a class="next_link pagess" href="javascript:next();">Next</a>';

                $('#page_navigation').html(navigation_html);

                //add active_page class to the first page link
                $('#page_navigation .page_link:first').addClass('active_page');

                //hide all the elements inside content div
                $('#content').children().css('display', 'none');

                //and show the first n (show_per_page) elements
                $('#content').children().slice(0, show_per_page).css('display', 'block');

            });

            function previous(){

                new_page = parseInt($('#current_page').val()) - 1;
                //if there is an item before the current active link run the function
                if($('.active_page').prev('.page_link').length==true){
                    go_to_page(new_page);
                }

            }

            function next(){
                new_page = parseInt($('#current_page').val()) + 1;
                //if there is an item after the current active link run the function
                if($('.active_page').next('.page_link').length==true){
                    go_to_page(new_page);
                }

            }
            function go_to_page(page_num){
                //get the number of items shown per page
                var show_per_page = parseInt($('#show_per_page').val());

                //get the element number where to start the slice from
                start_from = page_num * show_per_page;

                //get the element number where to end the slice
                end_on = start_from + show_per_page;

                //hide all children elements of content div, get specific items and show them
                $('#content').children().css('display', 'none').slice(start_from, end_on).css('display', 'block');

                /*get the page link that has longdesc attribute of the current page and add active_page class to it
        and remove that class from previously active page link*/
                $('.page_link[longdesc=' + page_num +']').addClass('active_page').siblings('.active_page').removeClass('active_page');

                //update the current page input field
                $('#current_page').val(page_num);
            }