Provide a datepicker widget for the birthday filed.

...from: http://atur-lalai.blogspot.com/2011/03/use-jquery-datepicker-in-drupal-7...

Use jquery datepicker in Drupal 7:

Use jquery datepicker in Drupal 7
  drupal_add_library('system','ui.datepicker');
  drupal_add_js('jQuery(document).ready(function(){jQuery( ".pickadate" ).datepicker({
      dateFormat: "dd/mm/yy",
      autoSize: true
    });});', 'inline'); 

  $form['textaje'] = array(
    '#type' => 'textfield',
    '#title' => t('Tarikh'),
    '#size' => 10,
    '#maxlength' => 10,
    '#attributes' => array('class' => array('pickadate')),
  ); 

No problem mate. I wish I could do more (like actually cod something). I thank YOU for putting all this effort and spending all your precious time on this.

Perfect! Thanx Niklas.

Thanx!