请各位高手帮忙结决!!!!!!!!!!!help me
代码:
<script language="javascript">
var time_all=document.all.settimen.value; //设定总的时间,单位为分钟;
Time_all=time_all*60;
function time_()
{
var mm,ss;
mm=parseInt(time_all/60);
ss=time_all % 60;
if(mm<10) mm='0'+mm;
if(ss<10) ss='0'+ss;
str=mm+'分'+ss+'秒';
document.all.timer.innerText= "考试时间还剩余:"+str;
time_all=time_all-1;
//if(time_all==0) form1.submit();
setTimeout('time_()',1000);
}
</script>
<form name="head" onsubmit="return time_();">
<table background="../images/main_bg.gif" align="center" valign="center" border="1" cellpadding="2" cellspacing="1" style="border-collapse: collapse" bordercolor="#C0C0C0" width="100%" >
<tr>
<td name="timer" id="timer" align="left" bgcolor="#E1E1E1">
考试时间还剩余:
</td>
<input type="hidden" name="settimen" value="ttt">
</tr>
</table>
</form>
运行时报错:document.all.settimen 不是对象!
请各位高手帮忙结决!!!!!!!!!!!help me