a ver si entiendes lo siguiente:
Código ASP:
Ver original<%
select1= request.form("select1")
select2= request.form("select2")
%>
<script language="javascript">
function pasadatos()
{
document.forms[0].submit();
}
</script>
<form method="post" action="estamismapagina.asp">
<select name="select1" id="select1" style="FONT-SIZE: 10px; WIDTH: 110px; FONT-FAMILY: Arial; COLOR: #000033" onChange="pasadatos()">
<option value="0" <%=if select1="0" then response.write("selected")%> >Seleccione</option>
<option value="10" <%=if select1="10" then response.write("selected")%>>10</option>
</select>
<select name="select2" id="select2" style="FONT-SIZE: 10px; WIDTH: 110px; FONT-FAMILY: Arial; COLOR: #000033" onChange="pasadatos()">
<option value="0" <%=if select2="0" then response.write("selected")%>>Seleccione</option>
<option value="100000" <%=if select2="100000" then response.write("selected")%> >100000</option>
</select>
</form>