[jQuery] Selecting current .jpg...

[jQuery] Selecting current .jpg...


I'm sure there's something really simple I'm missing, but for the life
of me I can't figure it out.
here's a link to the page: http://smple.com/jquery/image_alt/
Basically, I just want the current .jpg to display the pop up box.
Here's the .js
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$(document).ready(function(){
    $("img").wrap("<div class=\"images\"></div>");
    $("img").after("<span></span>");
    $(".images img").hover(
        function(over){
            var imgName = $(this).attr("alt");
            $("span").text(imgName);
            var altHeight = $("span").height();
            $("span").animate({
                 bottom: altHeight
            }, 400);
        },
        function(out){
            var imgName = $(this).attr("alt");
            $("span");
            $("span").animate({
                 bottom: "0px"
            }, 400);
        }
    );
});
Thanks for any help:)