jQuery(function() {

    //remove js-disabled class
    jQuery("#viewer").removeClass("js-disabled");

    //create new container for images
    jQuery("<div>").attr("id", "container").css({
        position:"absolute"
    }).width(jQuery(".thumbnail").length * 170).height(170).appendTo("div#viewer");

    //add images to container
    jQuery(".thumbnail").each(function() {
        jQuery(this).appendTo("div#container");
    });

    //work out duration of anim based on number of images (1 second for each image)
    var duration = jQuery(".thumbnail").length * 8000;

    //store speed for later (distance / time)
    var speed = (parseInt(jQuery("div#container").width()) + parseInt(jQuery("div#viewer").width())) / duration;

    //set direction
    var direction = "rtl";

    //set initial position and class based on direction
    (direction == "rtl") ? jQuery("div#container").css("left", jQuery("div#viewer").width()).addClass("rtl") : jQuery("div#container").css("left", 0 - jQuery("div#container").width()).addClass("ltr") ;

    //animator function
    var animator = function(el, time, dir) {

        //which direction to scroll
        if(dir == "rtl") {

            //add direction class
            el.removeClass("ltr").addClass("rtl");

            //animate the el
            el.animate({
                left:"-" + el.width() + "px"
            }, time, "linear", function() {

                //reset container position
                jQuery(this).css({
                    left:jQuery("div#imageScroller").width(),
                    right:""
                });

                //restart animation
                animator(jQuery(this), duration, "rtl");

                //hide controls if visible
                (jQuery("div#controls").length > 0) ? jQuery("div#controls").slideUp("slow").remove() : null ;

            });
        } else {

            //add direction class
            el.removeClass("rtl").addClass("ltr");

            //animate the el
            el.animate({
                left:jQuery("div#viewer").width() + "px"
            }, time, "linear", function() {

                //reset container position
                jQuery(this).css({
                    left:0 - jQuery("div#container").width()
                });

                //restart animation
                animator(jQuery(this), duration, "ltr");

                //hide controls if visible
                (jQuery("div#controls").length > 0) ? jQuery("div#controls").slideUp("slow").remove() : null ;
            });
        }
    }

    //start anim
    animator(jQuery("div#container"), duration, direction);

    //pause on mouseover
    jQuery(".thumbnail").live("mouseover", function() {

        //stop anim
        jQuery("div#container").stop(true);

        //show controls
        (jQuery("div#controls").length == 0) ? jQuery("<div>").attr("id", "controls").appendTo("div#outerContainer").css({
            opacity:0.7
        }).slideDown("slow") : null ;
        (jQuery("a#rtl").length == 0) ? jQuery("<a>").attr({
            id:"rtl",
            href:"#",
            title:"rtl"
        }).appendTo("#controls") : null ;
        (jQuery("a#ltr").length == 0) ? jQuery("<a>").attr({
            id:"ltr",
            href:"#",
            title:"ltr"
        }).appendTo("#controls") : null ;

        //variable to hold trigger element
        var title = jQuery(this).attr("title");

        //add p if doesn't exist, update it if it does
        (jQuery("p#title").length == 0) ? jQuery("<p>").attr("id", "title").text(title).appendTo("div#controls") : jQuery("p#title").text(title) ;
    });

    //restart on mouseout
    jQuery(".thumbnail").live("mouseout", function(e) {

        //hide controls if not hovering on them
        (e.relatedTarget == null) ? null : (e.relatedTarget.id != "controls") ? jQuery("div#controls").slideUp("slow").remove() : null ;

        //work out total travel distance
        var totalDistance = parseInt(jQuery("div#container").width()) + parseInt(jQuery("div#viewer").width());

        //work out distance left to travel
        var distanceLeft = (jQuery("div#container").hasClass("ltr")) ? totalDistance - (parseInt(jQuery("div#container").css("left")) + parseInt(jQuery("div#container").width())) : totalDistance - (parseInt(jQuery("div#viewer").width()) - (parseInt(jQuery("div#container").css("left")))) ;

        //new duration is distance left / speed)
        var newDuration = distanceLeft / speed;

        //restart anim
        animator(jQuery("div#container"), newDuration, jQuery("div#container").attr("class"));

    });

    //handler for ltr button
    jQuery("#ltr").live("click", function() {

        //stop anim
        jQuery("div#container").stop(true);

        //swap class names
        jQuery("div#container").removeClass("rtl").addClass("ltr");

        //work out total travel distance
        var totalDistance = parseInt(jQuery("div#container").width()) + parseInt(jQuery("div#viewer").width());

        //work out remaining distance
        var distanceLeft = totalDistance - (parseInt(jQuery("div#container").css("left")) + parseInt(jQuery("div#container").width()));

        //new duration is distance left / speed)
        var newDuration = distanceLeft / speed;

        //restart anim
        animator(jQuery("div#container"), newDuration, "ltr");
    });

    //handler for rtl button
    jQuery("#rtl").live("click", function() {

        //stop anim
        jQuery("div#container").stop(true);

        //swap class names
        jQuery("div#container").removeClass("ltr").addClass("rtl");

        //work out total travel distance
        var totalDistance = parseInt(jQuery("div#container").width()) + parseInt(jQuery("div#viewer").width());

        //work out remaining distance
        var distanceLeft = totalDistance - (parseInt(jQuery("div#viewer").width()) - (parseInt(jQuery("div#container").css("left"))));

        //new duration is distance left / speed)
        var newDuration = distanceLeft / speed;

        //restart anim
        animator(jQuery("div#container"), newDuration, "rtl");
    });
});