desactivar valor de un select

[Panino5001]

Fijate si te sirve:

Código:

<form id="form1" name="form1" method="post" action="">
 <select id="idioma1" class="campoTexto" name="idioma1" onchange="var t='<select id=&quot;idioma2&quot; class=&quot;campoTexto&quot; name=&quot;idioma2&quot;>';for(var i=0;this.options[i];i++){if(i==this.selectedIndex)continue;t+='<option value=&quot;'+this.options[i].value+'&quot;>'+this.options[i].innerHTML+'</option>'};if(this.selectedIndex==0)t='<select id=&quot;idioma2&quot; class=&quot;campoTexto&quot; name=&quot;idioma2&quot;>'+this.innerHTML;document.getElementById('idioma2').parentNode.innerHTML=t+'</select>';">
<option value="-">-</option>
<option value="ingles">Ingl&eacute;s</option>
<option value="frances">Franc&eacute;s</option>
<option value="portugues">Portugu&eacute;s</option>
</select>
<div>
<select id="idioma2" class="campoTexto" name="idioma2">
<option value="-">-</option>
<option value="ingles">Ingl&eacute;s</option>
<option value="frances">Franc&eacute;s</option>
<option value="portugues">Portugu&eacute;s</option>
</select>
</div>
</form>