Hola
Sebastian1046
Prueba este código:
Código PHP:
<html>
<head>
<style type="text/css">
.inutil {color:gray}
</style>
<script type="text/javascript">
var sele = 0;
function validar(obj) {
num = obj.selectedIndex;
if (obj.options[num].className == 'inutil')
obj.selectedIndex = sele;
else
sele = obj.selectedIndex;
}
</script>
</head>
<body>
<select onchange = "validar(this)">
<option>Uno</option>
<option class="inutil">Dos</option>
<option>Tres</option>
</select>
</body>
</html>
Saludos,
