A me cosi:
codice:
<!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>Javascript - Variabile Globale - prova</TITLE>
<script type="text/javascript">			// eseguo subito le operazioni d'utilità generale
var Variabile = "Ciao Mondo";
</script>

</HEAD>

<BODY>
<script type="text/javascript">
alert(Variabile);
</script>
</BODY>
</HTML>
va