El formulario es este:
<form id="IniciarSecc" name="IniciarSecc" method="POST" action="<?php echo $loginFormAction; ?>">
<table width="100%" border="0" cellspacing="2" cellpadding="2">
<tr>
<td align="right" valign="middle"> </td>
<td align="left" valign="middle"> </td>
</tr>
<tr>
<td align="right" valign="middle">Nombre del Usuario:</td>
<td align="left" valign="middle"><input name="usuario" type="text" id="usuario" size="50" maxlength="50" /></td>
</tr>
<tr>
<td align="right" valign="middle">Contraseña:</td>
<td align="left" valign="middle"><input name="contrasena" type="password" id="contrasena" size="50" /></td>
</tr>
<tr>
<td align="right" valign="middle"><input type="submit" name="button" id="button" value="Iniciar" /></td>
<td align="left" valign="middle"><input type="reset" name="button2" id="button2" value="Restablecer" /></td>
</tr>
</table>
</form>