Hey Friends, I have created custom registration form in drupal 6. i have used changed the behavior of the drupal registration page by adding this code in themes. template file

function earthen_theme($existing, $type, $theme, $path) {
  return array(
    // tell Drupal what template to use for the user register form
    'user_register' => array(
      'arguments' => array('form' => NULL),
      'template' => 'user_register', // this is the name of the template
    ),
  );
}

//php tag starts from here
$forms['access'] = array(
'#type' => 'fieldset',
'#title' => t('Access log settings'),
);
$form['my_text_field']=array( '#type' => 'textfield',
'#default_value' => $node->title,
'#size' => 30,
'#maxlength' => 50,
'#required' => TRUE
);


<div id="registration_form"><br>
  <div class="field">
   <?php
        print drupal_render($form['my_text_field']); // prints the username field
   ?>
   </div>
  <div class="field">
    <?php
      print drupal_render($form['account']['name']); // prints the username field
    ?>
  </div>
  <div class="field">
    <?php
      print drupal_render($form['account']['pass']); // print the password field
    ?>
  </div>
  <div class="field">
    <?php
      print drupal_render($form['account']['email']); // print the password field
    ?>
  </div>
  <div class="field">
    <?php
        print drupal_render($form['submit']); // print the submit button
     ?>
    </div>
</div>

How to make validation on "my_text_field" which is custmized.
and exactly i want that as soon as user click on my_text_field then datetime picker should be open and whichever date user select, that date should be value in my_text_field.
so guys help.

Thanks in advance,
nitish
Panchjanya Corporation