var?Imgvalue;
var?Count?=13;
var?Imgs?=?new?Array(Count);
var?ImgLoaded?=0;

//预加载图片
function?preLoadImgs()
{
alert('图片加载中请稍等......');
for(var?i=0;i<Imgs.length;i++){
Imgs[i]=new?Image();
downloadImage(i);
}
}

//加载单个图片
function?downloadImage(i)
{
????var?imageIndex?=?i+1;?//图片以1开始
????Imgs[i].src?=?"images/"+imageIndex+".jpg";
????Imgs[i].onLoad=validateImages(i);
}

//验证是否成功加载完成，如不成功则重新加载
function?validateImages(i){
if?(!Imgs[i].complete)
????{
?????window.setTimeout('downloadImage('+i+')',200);????
????}
else?if?(typeof?Imgs[i].naturalWidth?!=?"undefined"?&&?Imgs[i].naturalWidth?==?0)
????{
????window.setTimeout('downloadImage('+i+')',200);
????}
????else?
????{
????????ImgLoaded++
????????if(ImgLoaded?==?Count)
????????{
????????????document.getElementById('BtnStart').disabled=false;
????????????document.getElementById('BtnStop').disabled=false;
????????????alert('图片加载完毕！');
????????}
????}
}

//开始
function?RandStart()
{
????Init?=?setInterval('SetRand()',50);????
}
//随机显示
function?SetRand()
{
????imageIndex?=?Math.floor(Math.random()*Count);
????document.getElementById("ImgView").src?=?Imgs[imageIndex].src;
}

//结束
function?RandStop()
{
????window.clearInterval(Init);;
}
?

另外介绍两款不错的JS网页游戏

1.http://www.zentastic.com/temp/apophis2029/

2.http://www.paulbrunt.co.uk/bert/