$(document).ready(function(){

    var totWidth=0;

    var positions = new Array();

    $('#slides .slide').each(function(i){

        /* Traverse through all the slides and store their accumulative widths in totWidth */

        positions[i]= totWidth;

        totWidth += $(this).width();

        /* The positions array contains each slide's commulutative offset from the left part of the container */

        if(!$(this).width())

        {

            alert("Please, fill in width & height for all your images!");

            return false;

        }

    });

    $('#slides').width(totWidth);

​

    /* Change the cotnainer div's width to the exact width of all the slides combined */

​

    $('#menu ul li a').click(function(e,keepScroll){

​

            /* On a thumbnail click */

​

            $('li.menuItem').removeClass('act').addClass('inact');

            $(this).parent().addClass('act');

            var pos = $(this).parent().prevAll('.menuItem').length;

            $('#slides').stop().animate({marginLeft:-positions[pos]+'px'},450);

            /* Start the sliding animation */

            e.preventDefault();

            /* Prevent the default action of the link */

            // Stopping the auto-advance if an icon has been clicked:

            if(!keepScroll) clearInterval(itvl);

    });

    $('#menu ul li.menuItem:first').addClass('act').siblings().addClass('inact');

    /* On page load, mark the first thumbnail as active */

  //auto forwarding 

    var current=1;

    function autoAdvance()

    {

        if(current==-1) return false;

        $('#menu ul li a').eq(current%$('#menu ul li a').length).trigger('click',[true]);   // [true] will be passed as the keepScroll parameter of the click function on line 28

        current++;

    }

​

    // The number of seconds auto-advance in:

    var changeEvery = 100;

​

    var itvl = setInterval(function(){autoAdvance()},changeEvery*1000);

​

​

});