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<script>
$(function(){
    //LOOP OVER EVERY BUTTON
    $(".butFrame img").each(function(){
        //GET THE IMAGE/IMAGES
        var img = $(this);
        //GET THE SRC
        var src = img.attr("src");
        //REPLACE THUMBNAILSMALL WITH THUMBNAILLARGE
        var newSrc = src.replace("thumbnailsmall","thumbnaillarge");
        //CHANGE SRC TO NEWSRC
        img.attr("src", newSrc)
    });
});
</script>