<img id=t1><br>
<img id=t2><br>
<img id=t3><br>
<b>winner:</b>
<div id=reporter></div>
<script>
goal=300;
aryh=[document.getElementById('t1'),document.getElementById('t2'),document.getElementById('t3')];

winner='';
time=0;
for(i=0;i<aryh.length;i++) {aryh[i].style.position="relative";aryh[i].style.left=0;}
ary=[0,0,0];
winner=[];

function run() {
time++;
for(i=0;i<ary.length;i++) {
if(Math.random()>0.5 && ary[i]<10) ary[i]++; else ary[i]--;
if(ary[i]<0) ary[i]=0;
aryh[i].style.left=parseInt(aryh[i].style.left)+ary[i];
if(parseInt(aryh[i].style.left)>goal) {winner+=aryh[i].id+','+time+'<br>';ary.splice(i,1);aryh.splice(i,1);i--;}
}
reporter.innerHTML=winner;
}

setInterval('run()',200);
</script>

感謝一個頭兩個大，你的解答真是太棒了