js定时显示广告代码

function strToDate(str, ext) {
	if (str == null || str == '') return;
	var arys = new Array();
	arys = str.split('-');
	var newDate = new Date(arys[0], arys[1] - 1, arys[2], 9, 0, 0);
	if (ext) {
		newDate = new Date(newDate.getTime() + 1000 * 60 * 60 * 24);
	}
	return newDate;
}
function showit(str, start, end) {
	var date = new Date();
	var start = strToDate(start);
	var end = strToDate(end, false);
	if (date & gt; start & amp; & amp; date document.write(str);
}
}

调取：

showit('Your ads','2011-07-06','2011-07-18');