Quizá te sirva tomar la información a partir del objeto event:
Código PHP:
<!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>Documento sin título</title>
<script>
function testear(e){
var obj=e.srcElement || e.target;
alert('evento: '+e.type+'--name del objeto: '+obj.name)
}
</script>
</head>
<body>
<form id="ide" action="index.php" method="post" enctype="application/x-www-form-urlencoded">
<label>Email:<input id="email" type="text" name="email" title="Email de usuario" value="aqui_tu@email" size="20" onfocus="testear(event)" /></label>
<label>Contraseña:<input id="pass" type="text" name="pass" value="aquí tu contraseña" size="10" onchange="testear(event)" /></label>
<label><input type="checkbox" name="autologin" onclick="testear(event)" />Guardar</label>
<input type="submit" value="OK" />
</form>
</body>
</html>