Hola
BLAH !!
Un poco de JavaScript
:
Código PHP:
<html>
<head>
<script type="text/javascript">
function selecciona(obj) {
if (obj.value=='-')
obj.value = obj.getAttribute('sele');
else
obj.setAttribute('sele',obj.value);
}
</script>
</head>
<body>
<select sele="1" onchange = "selecciona(this)">
<option value="1">Uno</option>
<option value="-">---</option>
<option value="2">Dos</option>
</select>
</body>
</html>
Saludos,