css is not caling

I wan't to alternate colors to rows in the index view but when i call
css it is not calling
my code is as follows:
code of index view

<h2>Welcome <?php echo $id=$session->read('User')?></h2>
<div class="entries">
<?php
echo $html->css('default');
?>
<table cellpadding="0" cellspacing="0">
<?echo $html->tableHeaders(
array(

'Section',
'Submenu',
'Listitem',
'Detail',
'Actions'
)
);?>
<?php
$i = 0;
foreach ($entries as $entry):
$class = null;
if ($i++ % 2 == 0) {
$class ='class="altrow"';
}
?>
<tr<?php echo $class;?>>
<td><?php echo $entry['Section']['section']; ?></td>
<td><?php echo $entry['Submenu']['submenu']; ?></td>
<td><?php echo $entry['Entry']['Listitem']; ?></td>
<td><?php echo $entry['Entry']['Detail']; ?></td>
<td class="actions">
<?php echo $html->link('View','/entries/view/' . $entry['Entry']
['id'])?>
<?php echo $html->link('Edit','/entries/edit/' . $entry['Entry']
['id'])?>
<?php echo $html->link('Delete','/entries/delete/' . $entry['Entry']
['id'], null, 'Are you sure you want to delete record' )?>
</td>
</tr>
<?php endforeach; ?>
</table>
<ul class="actions">
<li><?php echo $html->link('New Content entry', '/entries/add'); ?></
li>
<li><?php echo $html->link('Logout','/users/logout');?></li>
<li><?php echo $html->link('Manage Account','/users/edit'.$form->value
('User'.$id));?></li>
</ul>
</div>

my css is follows
table {
background: #fff;
border:1px solid #ccc;
border-right:0;
clear: both;
color: #333;
margin-bottom: 10px;
width: 100%;
}
th
{
background: #f2f2f2;
border:1px solid #bbb;
border-top: 1px solid #fff;
border-left: 1px solid #fff;
text-align: center;
}

.altrow
{
background-color: #D4FFA8;
border-top: 1px solid #000000;
border-bottom: 1px solid #000000;
}

can anybody tell me what is the problem

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