<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title></title>
<style type="text/css">
#expirado {
display: none;
width: 200px;
height: 200px;
}
</style>
<script type="text/javascript">
var tstampActual = 0;
var comprobar = 10000;
function actividad() {
var tstamp = new Date().getTime();
if (Math.abs(tstampActual - tstamp) > comprobar) {
document.getElementById('expirado').style.display = 'inline';
} else {
document.getElementById('expirado').style.display = 'none';
}
}
window.addEventListener('load', function() {
document.body.addEventListener('mousemove', function() {
tstampActual = new Date().getTime();
}, false);
setInterval(actividad, comprobar);
});
</script>
</head>
<body>
<div id="expirado">El tiempo ha expirado</div>
</body>
</html>