Java pencet angka 9detik

<html>
	<head>
		<style>
			div{
				margin-left:35%;
			}
			.atas div{
				width:225px;
				height:50px;
				font-size:35px;
				text-align:center;
				margin-left:0%;
				border:1px solid black;
			}
			.bawah input{
				width:75px;
				height:75px;
			}
		</style>
		<script>
			var answer="";
			var key="";
			var keyLength;
			var time=10;
			var t;

			function startGame(){
				keyLength=10;
				generateKey();
				startTime();
			}
			function generateKey(){
				for(var i=1;i<=keyLength;i++){
					var x = Math.round(Math.random()*8)+1;
					key+=x;
				}
				document.getElementById("key").innerHTML=key;
			}

			function startTime(){
				time--;
				if(time==0){
					document.getElementById("time").innerHTML="<font color='red'>You Lose</font>";
					clearTimeout(t);
				}else{
					document.getElementById("time").innerHTML=time;
					t = setTimeout("startTime()",1000);
				}
			}

			function buttonClicked(nilai){
				var idx = answer.length;
				if(time>0){
					if(nilai == key[idx]){
						answer+=nilai;
						document.getElementById("answer").innerHTML="<font color='green'>"+answer+"</font>";
					}else{
						document.getElementById("answer").innerHTML="<font color='red'>"+answer+"</font>";
					}

					if(answer.length == key.length){
						clearTimeout(t);
						document.getElementById("answer").innerHTML="<font color='green'>You Win</font>";
					}
				}
			}
		</script>
	</head>
	<body onload="startGame()">
		<form>
			<div class="atas">
				Time Remaining:
				<br/>
				<div id="time" type="text">
				</div>
				<br/>
				Key:
				<br/>
				<div id="key" type="text">
				</div>
				<br/>
				Your answer:
				<br/>
				<div id="answer" type="text">
				</div>
				<br/>
			</div>
			<br/>
			<div class="bawah">
				<input type="button" value="1" onclick="buttonClicked(1)"/>
				<input type="button" value="2" onclick="buttonClicked(2)"/>
				<input type="button" value="3" onclick="buttonClicked(3)"/>
				<br/>
				<input type="button" value="4" onclick="buttonClicked(4)"/>
				<input type="button" value="5" onclick="buttonClicked(5)"/>
				<input type="button" value="6" onclick="buttonClicked(6)"/>
				<br/>
				<input type="button"  value="7" onclick="buttonClicked(7)"/>
				<input type="button"  value="8" onclick="buttonClicked(8)"/>
				<input type="button"  value="9" onclick="buttonClicked(9)"/>
			</div>
		</form>
	</body>
</html>