jQuery(document).ready(function(){
    var currentDate = new Date();
    jQuery('.newmarkList').each(function(){
        var pass       // passage time
             = 240;
        var content    // display content
             = '<img class="newmark" src="http://www.suwa-j.co.jp/image/newmark.gif" alt="10日以内の新着ブログ記事" width="18" height="5" title="10日以内の新着ブログ記事" />';
        var newmarkAttr = jQuery(this).attr('title');
        newmarkAttr = newmarkAttr.replace(/年|月|日|時|分/g,':');
        newmarkAttr = newmarkAttr.replace(/\s|秒.*/g,'');
        var time = newmarkAttr.split(":");
        var entryDate = new Date(time[0], time[1]-1, time[2], time[3], time[4], time[5]);
        var now = (currentDate.getTime() - entryDate.getTime())/(60*60*1000); 
        now = Math.ceil(now);
       if(now <= pass){
            jQuery(this).after(content);
        }
    });
});