var imgs = ['big-image1.jpg', 'big-image2.jpg', 'big-image3.jpg']; // 图片
var timeout = 8000;	// 超时时间
var counter = 1;	// 计数器
var baseurl = '/public/images/';	// 基本路径

function changeimage()
{
	if (counter >= imgs.length)
	{
		counter = 0;
	}

	var img = document.getElementById('big-image');
	img.src = baseurl + imgs[counter];

	counter++;
}
setInterval("changeimage()", timeout);