I have a problem with Nokia6600, the device keeps caching my wml page. What I'm I doing wrong?

Here is the WML page

<meta http-equiv="Cache-Control" content="no-cache" />
<meta http-equiv="Cache-Control" content="max-age=1" />
<meta http-equiv="Cache-Control" content="must-revalidate" forua="true" />
<card id="nInfo" title="Demo">

<p align="left">Demo

Input msisdn:
<input name="msisdn" type="text" format="NNNNNNNN"/><br/>
Input pincode:
<input name="pin" type="text" format="NNNN"/><br/>

<anchor title="Log ind">
<go href="login.asp" method="post">
<postfield name="msisdn" value="$(msisdn)"/>
<postfield name="pin" value="$(pin)"/>
<postfield name="ss" value="_SS_"/>
<anchor title="Abort">
<go href="../" method="post">

I'm my ASP code I'm sending the following:

Response.Expires = -1
Response.CacheControl ="no-store, no-cache, must-revalidate"

But Nokia6600 keeps on caching the page.

Does any one have a suggestion?

Jan Nielsen