$(document).ready(function() {
    var els = $(".thumbnail a");
    els.attr("onclick", "javascript:void(0);");
    $(".thumbnail a").click(function(e) {
        e.preventDefault();
        var largePath = $(this).attr("href");
        var largeAlt = $(this).attr("title");
        $("#currentImage").attr({ src: largePath, alt: largeAlt });
        $(".image-preview-caption span a").html("" + largeAlt + "");
        return false;
    });
});