codice:
<html> 
<head> 
<title>...</title> 
<script type="text/javascript"> 
function Menu(links) { 
window.open(links[links.selectedIndex].value); 
} 
</script>
</head> 
<body> 
<form> 
<select name="select" onChange="Menu(this)">___ 
<option value="javascript:void(0)" selected>--- SELEZIONA</option>___ 
<option value="http://www.google.it">pagina uno</option>___ 
<option value="pagina2.htm">pagina 2</option>___ 
<option value="pagina3.htm">pagina 3</option>___ 
</select> 
</form>
</body>
</html>