как передать значение checkbox? - Разработка расширений для Joomla 1.5

<?php				        
$db =& JFactory::getDBO();					   
$query = "SELECT `activity` FROM #__activity ";
$db->setQuery($query);		           
					   
$mas_activity = array();
$mas_activity = $db->loadResultArray();
//print_r($mas_activity);
$count_mas_activity = count($mas_activity);
//echo $count_mas_activity;
					
jimport('joomla.html.pane');
$pane =& JPane::getInstance('Sliders');
						
echo $pane->startPane('activity');
						
 {
   for ($i=0;$i<$count_mas_activity;$i++)
	{
	  echo $pane->startPanel($mas_activity[$i], 'panel'.$i);
	  $db =& JFactory::getDBO();
	  $query = "SELECT `id` FROM #__activity WHERE `activity` = '$mas_activity[$i]' ";
	  $db->setQuery($query);
	  $plans = $db->loadResult();;
          $db =& JFactory::getDBO();
	  $query = "SELECT `activity_plans`, `id` FROM #__activity_plans WHERE `activity_id` = '$plans' ";
		 $db->setQuery($query);
			 if (count($db->loadResultArray()) == 0)
				 echo "<br/><div style='padding-left: 15px;'>".JText::_( 'No info' )."</div><br/>"; 
			 else {
				 $mas_activity_plans = array();
				 $mas_activity_plans = $db->loadAssocList();
				 $count_mas_activity_plans = count($mas_activity_plans);
				 echo "<br/><div style='padding-left: 15px;'>";
					 for ($j=0;$j<$count_mas_activity_plans;$j++)
						 {
echo $mas_activity_plans[$j][activity_plans]."<input name='activityusers[]' value='".$mas_activity_plans[$j][id]."' type='checkbox'/><br/>";																		
																		
						}															
          echo "</div><br/>";		}																																			 
echo $pane->endPanel();
}								
}
							
echo $pane->endPane();				
?>