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