Jquery help : How to implement a Previous/Next & Play/Pause toggle for this script

Question

(function($){

// Creating the sweetPages jQuery plugin:
$.fn.sweetPages = function(opts){

    // If no options were passed, create an empty opts object
    if(!opts) opts = {};

    var resultsPerPage = opts.perPage || 3;
    var swDiv = opts.getSwDiv || "swControls";
    // The plugin works best for unordered lists, althugh ols would do just as well:
    var ul = this;
    var li = ul.find('li');

    li.each(function(){
        // Calculating the height of each li element, and storing it with the data method:
        var el = $(this);
        el.data('height',el.outerHeight(true));
    });

    // Calculating the total number of pages:
    var pagesNumber = Math.ceil(li.length/resultsPerPage);

    // If the pages are less than two, do nothing:
    if(pagesNumber<2) return this;

    // Creating the controls div:
    //var swControls = $('<div class="swControls">');

    var swControls = $('<div class='+swDiv+'>');

    for(var i=0;i<pagesNumber;i++)
    {
        // Slice a portion of the lis, and wrap it in a swPage div:
        li.slice(i*resultsPerPage,(i+1)*resultsPerPage).wrapAll('<div class="swPage" />');

        // Adding a link to the swControls div:
        swControls.append('<a href="" class="swShowPage">'+(i+1)+'</a>');

    }


    ul.append(swControls);

    var maxHeight = 0;
    var totalWidth = 0;

    var swPage = ul.find('.swPage');
    swPage.each(function(){

        // Looping through all the newly created pages:

        var elem = $(this);

        var tmpHeight = 0;
        elem.find('li').each(function(){tmpHeight+=$(this).data('height');});

        if(tmpHeight>maxHeight)
            maxHeight = tmpHeight;

        totalWidth+=elem.outerWidth();

        elem.css('float','left').width(ul.width());
    });

    swPage.wrapAll('<div class="swSlider" />');

    // Setting the height of the ul to the height of the tallest page:
    //ul.height(maxHeight);

    var swSlider = ul.find('.swSlider');
    swSlider.append('<div class="clear" />').width(totalWidth);

    var hyperLinks = ul.find('a.swShowPage');

    hyperLinks.click(function(e){

        // If one of the control links is clicked, slide the swSlider div 
        // (which contains all the pages) and mark it as active:

        $(this).addClass('active').siblings().removeClass('active');

        swSlider.stop().animate({'margin-left':-(parseInt($(this).text())-1)*ul.width()},'slow');
        e.preventDefault();
    });

    // Mark the first link as active the first time this code runs:
    hyperLinks.eq(0).addClass('active');

    // Center the control div:
    swControls.css({
        'right':'10%',
        'margin-left':-swControls.width()/2
    });

    return this;

}})(jQuery);