JS Dynamic Quiz with jQuery

From the course: http://javascriptissexy.com/how-to-learn-javascript-properly/

HTML

<script src="http://fonts.googleapis.com/css?family=Rokkitt:700"></script>
<html >

<head>
	<meta http-equiv="Content-Type" content="text/html;charset=UTF-8">
<script src='https://cdn.bootcss.com/zepto/1.0rc1/zepto.min.js'></script>
<script type="text/javascript">
var c=0
var t
var d
function load()
{

 document.getElementById('txt').value=d
 c=c+1
 d=c/100
 t=setTimeout("timedCount()",10)
 }




function stopCount()
 {
 clearTimeout(t)
      $.ajax({
             type: "POST",
             url: "inserttime.php",
             data: {
                span:$("#txt").val(),
                },
             dataType: "json",
             success: function(data){
                console.log(data);
                if(data==1){
                     document.getElementById('txt').innerHTML = 'ok';
                    alert("success")
                }else{
                    alert("fail")
                }
             }
         })

 }

</script>
</head>

<body>
<form>

<input type="text" id="txt">
<input type="button" value="Stop count!" onClick="stopCount()">
</form>
</body>