(function($){

/* -------------------------------------------------------------------
    画像置換
------------------------------------------------------------------- */
    $.fn.mouseover = function(settings){

        settings = $.extend({
            name: "_over"
        }, settings);

        return this.each(function(){
            if (!this) return false;
            var src   = $(this).attr("src");
            var ftype = src.substring(src.lastIndexOf('.'), src.length);
            var hsrc  = src.replace(ftype, settings.name + ftype);
            $(this).hover(function (){
                $(this).attr("src",hsrc);
            }, function(){
                $(this).attr("src",src);
            });
        });
    }

})(jQuery);