si lo hago de la siguiente manera
<form name="formular" id="formular" action="/scripts/modules/registration/login.asp" method="post">
<input type="hidden" name="lid" id="lid" value="1">
<table>
<tr>
<td align=right>
<LABEL FOR="username">Usuario</LABEL>
</td>
<td>
<input type="text" name="username" id="username" value="<!--WTD_REGISTR(USERNAME)-->" maxlength="20">
</td>
</tr>
<tr>
<td align=right>
<LABEL FOR="password">Contrasena</LABEL>
</td>
<td>
<input type="password" name="password" id="password" value="<!--WTD_REGISTR(PASSWORD)-->" maxlength="20">
</td>
</tr>
<tr>
<td align=right colspan=2>
<input type="submit" name="send" id="send" value="Entrar">
</td>
</tr>
</table>
</form>