search filter in cake 1.3

hi guys,... can anyone help please,... I'm using cake 1.3

how can I filter search results by user firstname 

this is my form input: 

<?php echo $this->Form->create('User', array('action' => 'search')); ?>

<?php echo $this->Form->text('find', array('style' => 'width: 60px')) ?>&nbsp;

<?php echo $this->Form->end(__('Search', true)); ?> 

and this is my users_controller.php 

  function search() 

  {

       

$this->User->recursive = 0;

$params = $this->params['url']; 

                if (!array_key_exists("find", $params)) { 

                        $this->set('users', $this->paginate()); 

                } 

                else 

{ 

$this->set('users', $this->paginate(array("User.firstname LIKE '{$params['find']}%'"))); 

} 

  } 

thanks in advance 

chris

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