<script>
function whichButton(e)
{
document.getElementById("1").innerHTML=e.keyCode;
}
</script>
<body onkeydown="whichButton(event)"><div id="1"></div></body>
<script>
function whichButton(e)
{
document.getElementById("1").innerHTML=e.keyCode;
}
</script>
<body onkeydown="whichButton(event)"><div id="1"></div></body>