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<   $headers = array(
---
>   $headers1 = array(
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<   $rows = array();
---
>   $rows1 = array();
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> 	$headers2 = array();
> 	
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<     $headers['category'][] = array('data' => $category, 'class' => 'assignment_category');
<     $headers['possible'][] = array('data' => $assignment->possible, 'class' => 'assignment_possible');
<     $headers['date'][]     = array('data' => format_date($assignment->created, 'custom', 'Y/m/d'), 'class' => 'assignment_date');
<     $headers['title'][]    = array('data' => l($assignment->title, 'node/'.$assignment->nid), 'class' => 'assignment_title');
---
>     $headers2['category'][] = array('data' => $category, 'class' => 'assignment_category');
>     $headers2['possible'][] = array('data' => $assignment->possible, 'class' => 'assignment_possible');
>     $headers2['date'][]     = array('data' => format_date($assignment->created, 'custom', 'Y/m/d'), 'class' => 'assignment_date');
>     $headers2['title'][]    = array('data' => l($assignment->title, 'node/'.$assignment->nid), 'class' => 'assignment_title');
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> 	$rows2 = array();
> 	
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> 		$student_name = array();
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<     $row[] = l($account->name, 'gradebook/' . $gradebook->tid . '/' . $account->uid, '', $sort);
---
>     $student_name[] = l($account->name, 'gradebook/' . $gradebook->tid . '/' . $account->uid, '', $sort);
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<     $rows[] = $row;
---
> 		$rows1[] = $student_name;
>     $rows2[] = $row;
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<   return theme('gradebook_table', $headers, $rows, array('class' => 'gradebook'));
---
>   $output .= '<table class="gradebook"><tr><td>';
>   $output .= theme('gradebook_table', $headers1, $rows1, array('class' => 'gradebook')) .'</td><td><div class="scrollable">'. theme('gradebook_table', $headers2, $rows2, array('class' => 'gradebook')) .'</div></td></tr></table>';
> 
>   return $output;