$(document).ready(function(){
var currentDate = new Date();
$('.newmark').each(function(){
var pass = 72;
var content = '<img src="http://www.asojuku.ac.jp/images/news_new.gif" alt="New" width="21" height="9" title="New" />';
var newmarkAttr = $(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){
$(this).after(content);
}
});
});