$(document).ready(function() {   
    $(".main_image .desc").show(); //show the banner
    $(".main_image .block").animate({ opacity: 0.85 }, 1); //set opacity

    //script below will change the main_image when a list-item in the image_tjhumn is clicked. Each line
    //also contains a comments explaining which jquery actions are being performed

    $(".image_thumb ul li:first").addClass('active'); //Add the active class (highlights the very first list item by default)
    $(".image_thumb ul li").mouseover(function() {
        //Set Variables
        var imgAlt = $(this).find('img').attr("alt"); //Get Alt Tag of Image
        var imgTitle = $(this).find('a').attr("href"); //Get Main Image URL        
        var imgDesc = $(this).find('.block').html();  //Get HTML of the "block" container
        var imgRedirectURL = $(this).find('.hF').val();
        var imgDescHeight = $(".main_image").find('.block').height(); //Find the height of the "block"

        if ($(this).is(".active")) {  //If the list item is active/selected, then...
            return false; // Don't click through - Prevents repetitive animations on active/selected list-item
        }
        else { //If not active then...
            //Animate the Description
            $(".main_image .block").animate({ opacity: 0, marginBottom: -imgDescHeight }, 250, function() { //Pull the block down (negative bottom margin of its own height)
                $(".main_image .block").html(imgDesc).animate({ opacity: 0.85, marginBottom: "0" }, 250); //swap the html of the block, then pull the block container back up and set opacity
                $(".main_image .block p a").attr({ href: imgRedirectURL });
                $(".main_image img").attr({ src: imgTitle, alt: imgAlt }); //Switch the main image (URL + alt tag)
            });
        }
        //Show active list-item
        $(".image_thumb ul li").removeClass('active'); //Remove class of 'active' on all list-items
        $(this).addClass('active');  //Add class of 'active' on the selected list
        return false;

    }).hover(function() { //Hover effects on list-item 
        $(this).addClass('hover'); //Add class "hover" on hover 
    }, function() {
        $(this).removeClass('hover'); //Remove class "hover" on hover out
    });



    /** on each click, show and hide the description **/
    $("a.collapse").click(function() {
        $(".main_image .block").slideToggle(); //Toggle the description (slide up and down)
        $("a.collapse").toggleClass("show"); //Toggle the class name of "show" (the hide/show tab)
    });

});