Fijate si te sirve:
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 type="text/javascript">
var unobk=uno;
function uno(){
alert(1);
uno=dos;
}
function dos(){
alert(2);
uno=tres;
}
function tres(){
alert(3);
uno=unobk;//volver a empezar
}
</script>
</head>
<body>
<form id="form1" name="form1" method="post" action="">
<label>
<input type="button" name="button" id="button" value="test" onclick="uno();" />
</label>
</form>
</body>
</html>