Postfields in WML does not pass all variables to next WML page

I am writing a function as listed below. My problem is that this form passes
only the variable 'state' and not the others.
Can somebody help me?

Thanks,

Gustaaf


function SelectIndia($land,$mcc,$opco,$iru,$cc) {

print 'Staat: <select name="state">
<option value="AP">Andhra Pradesh</option>
<option value="AR">Arunachal Pradesh</option>
<option value="AS">Assam</option>
<option value="BH">Bihar</option>
<option value="CH">Chennai/Madras</option>
<option value="CG">Chatisgargh</option>
<option value="DE">Dehli</option>
<option value="MA">Goa</option>
<option value="GU">Gujarat</option>
<option value="HA">Haryana</option>
<option value="HI">Himachal Pradesh</option>
<option value="JA">Jammu / Kashmir</option>
<option value="JH">Jharkland</option>
<option value="KA">Karnataka</option>
<option value="KE">Kerala</option>
<option value="KO">Kolkata/Calcutta</option>
<option value="MP">Madhya Pradesh</option>
<option value="MA">Maharashtra</option>
<option value="MN">Manipur</option>
<option value="ME">Meghalaya</option>
<option value="MB">Mumbai/Bombay</option>
<option value="NA">Nagaland</option>
<option value="NI">Nizoram</option>
<option value="OR">Orissa</option>
<option value="PO">Pondicherry</option>
<option value="PU">Punjab</option>
<option value="RA">Rajasthan</option>
<option value="TN">Tamil Nadu</option>
<option value="TR">Tripura</option>
<option value="UE">Uttar Pradesh East</option>
<option value="UW">Uttar Pradesh West</option>
<option value="UT">Uttaranchal</option>
<option value="WB">West Bengal</option>
</select>

<br/>

<anchor>
Selecteer
<go href="roamform.php" method="get">
<postfield name="opco" value="$(opco)"/>
<postfield name="type" value="2"/>
<postfield name="state" value="$(state)"/>
<postfield name="lnd" value="$(land)"/>
<postfield name="iru" value="$(iru)"/>
<postfield name="cc" value="$(cc)"/>
<postfield name="mcc" value="$mcc"/>
</go>
</anchor>';

}