<div id='change' onclick='change_num()'>1</div>
<script>
function change_num(){
o = document.getElementById('change');
if(o.innerText == '1'){
o.innerText = '0';
}else
o.innerText = '1';
}
</script>
<script>
function change_num(){
o = document.getElementById('change');
if(o.innerText == '1'){
o.innerText = '0';
}else
o.innerText = '1';
}
</script>
<head>
<title>
modify
</title>
<script language="javascript">
function change(){
if (cc.innerText == "0")cc.innerText = "1";
else cc.innerText = "0";
}
</script>
</head>
<body>
<div id="cc" onclick="change()" style="border:solid 1px black;width:10;cursor:hand">0</div>
</body>
</html>
<script>
function change_num(){
o = document.getElementById('change');
o.innerText=(o.innerText == '1')?0:1;
}
</script>