[SMARTY] checkboxes and "checked" retained

I'm trying to get form "checked" checkboxes to remain checked after a submit when the form reappears to the user with error messages. The form doesn't retain the "checked" condition, as the boxes are empty after the form page re-launches.

Here is my php/smarty code:

  if (isset($outreach))	 {
     for ($i=0; $i <= count($_POST['outreach']) - 1; $i++)	{
       $outreach[$i] = trim($_POST['outreach'][$i]);
       $_SESSION['outreach'] = $outreach[$i];
     }
     $smarty->assign('outreach',$_SESSION['outreach']);
  }


Here is the html w/smarty code:

   <td align="left"><input type="checkbox" name="outreach[]" value="Summer_reading_club00" id="Summer_reading_club00"
                           {if !empty($outreach.Summer_reading_club00)} checked="checked" {/if} />
                           Summer reading club </td>



Would appreciate any help. Thanks.
-- Margie

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