<SCRIPT LANGUAGE="JavaScript">
<!--
var time="3600";
var atime="300"; //定义时间
var etime="0";
function count(){
setTimeout("count()",1000); //1000毫秒＝1秒加载一次计数
document.form1.rest.value=format(Math.floor(time/60))+"分:"+format(time%60)+"秒";
time--;
if(time==atime){
alert("还剩5分钟");
}
if(time==etime-1){
alert("时间到，已经自动提交");
document.form1.submit();
}
}

function format(time){
var len=time.toString().length;
for(i="0";i<2-len;i++){
time+="0";
}
return time;
}

//-->
</SCRIPT>
<form action="Save.Asp" method="post" name="form1" />
<INPUT TYPE="button" Value="开始" onClick="count()" />
<INPUT TYPE="text" NAME="rest" Value="60分:00秒" />
</form>