// 設定ここから
var pass = 7; //1日単位
var content = 'New!!'; //表示文字
//設定ここまで

function newMark(){
	var currentDate = new Date(); 
	var spans = document.getElementsByTagName('span');
	for(i=0; i<spans.length; i++){
		var span = spans[i];
		var value = span.innerHTML;
		if(span.getAttribute('class')=='new' || span.getAttribute('className')=='new'){
			var entryDate = new Date(value);
			var passed = Math.floor((currentDate.getTime()-entryDate.getTime())/(24*60*60*1000));
			if(passed <= pass){
				span.innerHTML = content;
				span.style.display = 'inline';
			}
		}
	}
}

window.onload = function(){
	newMark();
}