A ver si esto soluciona tu problema. Solo tienes que adecuarlo a tu situacion.
<%@ Language=VBScript %>
<HTML>
<HEAD>
<META NAME="GENERATOR" Content="Microsoft Visual Studio 6.0">
</HEAD>
<BODY>
<P> </P>
<form name="admin" method="post" action="Test.asp">
<SELECT name="tipo" class="ComboBox" onclick="actualizarCombo()">
<OPTION value="NINGUNO">Ninguno</OPTION>
<OPTION value="menu">menu</OPTION>
<OPTION value="*">todo</OPTION>
</SELECT>
<SELECT name="operacion" class="ComboBox" disabled>
<OPTION value="NA">N_A</OPTION>
<OPTION value=""></OPTION>
<OPTION value=""></OPTION>
<OPTION value=""></OPTION>
<OPTION value=""></OPTION>
<OPTION value=""></OPTION>
<OPTION value=""></OPTION>
<OPTION value=""></OPTION>
<OPTION value=""></OPTION>
<OPTION value=""></OPTION>
<OPTION value=""></OPTION>
<OPTION value=""></OPTION>
<OPTION value=""></OPTION>
<OPTION value=""></OPTION>
</SELECT>
</form>
</BODY>
</HTML>
<script language="JavaScript">
function setOptionText(opciones){
for (loop=0; loop < document.admin.operacion.options.length; loop++){
document.admin.operacion.options[loop].text = opciones[loop];
%
