<html>
<head>
<script type="text/javascript">
function ns(s)
{
if (s.selectedIndex>0){
location.href=s.options[s.selectedIndex].value;
}
}
//------------------------------------------------------------------------
</script>
</head>
<body>
<form>
<select id='Menu' onchange="ns(this)" size="15">
<option value="-1">-Seleccione una Opcion -</option>
<option value="http://www.solocodigo.com">Solocodigo</option>
<option value="http://www.google.com">Google</option>
<option value="http://www.yahoo.com">Yahoo!</option>
</select>
</form>
</body>
</html>