diff --git a/wp-admin/categories.php b/wp-admin/categories.php
index 8c1f52ffc9..41312ea5dd 100644
--- a/wp-admin/categories.php
+++ b/wp-admin/categories.php
@@ -146,7 +146,7 @@ $messages[5] = __('Category not updated.');
 <table class="widefat">
 	<thead>
 	<tr>
-		<th scope="col"><div style="text-align: center"><input type="checkbox" onclick="checkAll(document.getElementById('posts-filter'));" /></div></th>
+		<th scope="col" class="check-column"><div style="text-align: center"><input type="checkbox" onclick="checkAll(document.getElementById('posts-filter'));" /></div></th>
         <th scope="col"><?php _e('Name') ?></th>
         <th scope="col"><?php _e('Description') ?></th>
         <th scope="col" style="text-align: center"><?php _e('Posts') ?></th>
diff --git a/wp-admin/css/global.css b/wp-admin/css/global.css
index 660b86060d..292d7b04b9 100644
--- a/wp-admin/css/global.css
+++ b/wp-admin/css/global.css
@@ -73,6 +73,11 @@ textarea, input, select {
 	text-align: left;
 }
 
+.widefat .check-column {
+	text-align: center;
+	width: 3%;
+}
+
 .widefat thead, .thead { background: #464646; color: #d7d7d7; }
 
 .wrap {
diff --git a/wp-admin/edit-link-categories.php b/wp-admin/edit-link-categories.php
index 8804e2ddc2..60b7a42abb 100644
--- a/wp-admin/edit-link-categories.php
+++ b/wp-admin/edit-link-categories.php
@@ -94,7 +94,7 @@ if ( $page_links )
 <table class="widefat">
 	<thead>
 	<tr>
-        <th scope="col" style="text-align: center"><input type="checkbox" onclick="checkAll(document.getElementById('posts-filter'));" /></th>
+        <th scope="col" class="check-column"><input type="checkbox" onclick="checkAll(document.getElementById('posts-filter'));" /></th>
         <th scope="col"><?php _e('Name') ?></th>
         <th scope="col"><?php _e('Description') ?></th>
         <th scope="col" width="90" style="text-align: center"><?php _e('Links') ?></th>
diff --git a/wp-admin/edit-post-rows.php b/wp-admin/edit-post-rows.php
index fde7c5eeb2..6c06332abc 100644
--- a/wp-admin/edit-post-rows.php
+++ b/wp-admin/edit-post-rows.php
@@ -33,7 +33,7 @@ foreach($posts_columns as $column_name=>$column_display_name) {
 
 	case 'cb':
 		?>
-		<th scope="row" style="text-align: center"><input type="checkbox" name="delete[]" value="<?php the_ID(); ?>" /></th>
+		<th scope="row" class="check-column"><input type="checkbox" name="delete[]" value="<?php the_ID(); ?>" /></th>
 		<?php
 		break;
 	case 'modified':
diff --git a/wp-admin/edit-tags.php b/wp-admin/edit-tags.php
index 9127c01f9a..8a3dc2d9e5 100644
--- a/wp-admin/edit-tags.php
+++ b/wp-admin/edit-tags.php
@@ -156,7 +156,7 @@ if ( $page_links )
 <table class="widefat">
 	<thead>
 	<tr>
-		<th scope="col" style="text-align: center"><input type="checkbox" onclick="checkAll(document.getElementById('posts-filter'));" /></th>
+		<th scope="col" class="check-column"><input type="checkbox" onclick="checkAll(document.getElementById('posts-filter'));" /></th>
         <th scope="col"><?php _e('Name') ?></th>
         <th scope="col" width="90" style="text-align: center"><?php _e('Posts') ?></th>
 	</tr>
diff --git a/wp-admin/includes/template.php b/wp-admin/includes/template.php
index a44f641d3f..ae4d6ee3fa 100644
--- a/wp-admin/includes/template.php
+++ b/wp-admin/includes/template.php
@@ -53,7 +53,7 @@ function _cat_row( $category, $level, $name_override = false ) {
 	$category->count = number_format_i18n( $category->count );
 	$posts_count = ( $category->count > 0 ) ? "<a href='edit.php?cat=$category->term_id'>$category->count</a>" : $category->count;
 	$output = "<tr id='cat-$category->term_id'$class>
-		<th scope='row' style='text-align: center'><input type='checkbox' name='delete[]' value='$category->term_id' /></th>
+		<th scope='row' class='check-column'><input type='checkbox' name='delete[]' value='$category->term_id' /></th>
 		<td>$edit</td>
 		<td>$category->description</td>
 		<td align='center'>$posts_count</td>\n\t</tr>\n";
@@ -81,7 +81,7 @@ function link_cat_row( $category ) {
 	$category->count = number_format_i18n( $category->count );
 	$count = ( $category->count > 0 ) ? "<a href='link-manager.php?cat_id=$category->term_id'>$category->count</a>" : $category->count;
 	$output = "<tr id='link-cat-$category->term_id'$class>" .
-		'<td style="text-align: center"> <input type="checkbox" name="delete[]" value="' . $category->term_id . '" /></td>' .
+		'<th scope="row" class="check-column"> <input type="checkbox" name="delete[]" value="' . $category->term_id . '" /></th>' .
 		"<td>$edit</td>
 		<td>$category->description</td>
 		<td align='center'>$count</td>";
@@ -234,7 +234,7 @@ function _tag_row( $tag, $class = '' ) {
 
 		$out = '';
 		$out .= '<tr id="tag-' . $tag->term_id . '"' . $class . '>';
-		$out .= '<td style="text-align: center"> <input type="checkbox" name="delete_tags[]" value="' . $tag->term_id . '" /></td>';
+		$out .= '<th scope="row" class="check-column"> <input type="checkbox" name="delete_tags[]" value="' . $tag->term_id . '" /></th>';
 		$out .= '<td><a href="edit-tags.php?action=edit&amp;tag_ID=' . $tag->term_id . '">' .
 			apply_filters( 'term_name', $tag->name ) . '</td>';
 
@@ -368,7 +368,7 @@ foreach ($posts_columns as $column_name=>$column_display_name) {
 
 	case 'cb':
 		?>
-		<th scope="row" style="text-align: center"><input type="checkbox" name="delete[]" value="<?php the_ID(); ?>" /></th>
+		<th scope="row" class="check-column"><input type="checkbox" name="delete[]" value="<?php the_ID(); ?>" /></th>
 		<?php
 		break;
 	case 'modified':
@@ -550,7 +550,7 @@ function user_row( $user_object, $style = '', $role = '' ) {
 	}
 	$role_name = translate_with_context($wp_roles->role_names[$role]);
 	$r = "<tr id='user-$user_object->ID'$style>
-		<td><input type='checkbox' name='users[]' id='user_{$user_object->ID}' class='$role' value='{$user_object->ID}' /></td>
+		<th scope='row' class='check-column'><input type='checkbox' name='users[]' id='user_{$user_object->ID}' class='$role' value='{$user_object->ID}' /></th>
 		<td><strong>$edit</strong></td>
 		<td>$user_object->first_name $user_object->last_name</td>
 		<td><a href='mailto:$email' title='" . sprintf( __('e-mail: %s' ), $email ) . "'>$email</a></td>
diff --git a/wp-admin/link-manager.php b/wp-admin/link-manager.php
index 636731b44a..13958074c9 100644
--- a/wp-admin/link-manager.php
+++ b/wp-admin/link-manager.php
@@ -143,7 +143,7 @@ if ( $links ) {
 <table class="widefat">
 	<thead>
 	<tr>
-	<th style="text-align: center"><input type="checkbox" onclick="checkAll(document.getElementById('posts-filter'));" /></th>
+	<th scope="col" class="check-column"><input type="checkbox" onclick="checkAll(document.getElementById('posts-filter'));" /></th>
 <?php foreach($link_columns as $column_display_name) {
 	echo $column_display_name;
 } ?>
@@ -166,7 +166,7 @@ if ( $links ) {
 		++ $i;
 		$style = ($i % 2) ? '' : ' class="alternate"';
 		?><tr id="link-<?php echo $link->link_id; ?>" valign="middle" <?php echo $style; ?>><?php
-		echo '<td align="center"><input type="checkbox" name="linkcheck[]" value="'.$link->link_id.'" /></td>';
+		echo '<th scope="row" class="check-column"><input type="checkbox" name="linkcheck[]" value="'.$link->link_id.'" /></th>';
 		foreach($link_columns as $column_name=>$column_display_name) {
 			switch($column_name) {
 				case 'name':
diff --git a/wp-admin/users.php b/wp-admin/users.php
index 5b26483bab..2b8a8a65ca 100644
--- a/wp-admin/users.php
+++ b/wp-admin/users.php
@@ -325,7 +325,7 @@ unset($role_links);
 <table class="widefat">
 <tbody>
 <tr class="thead">
-	<th><input type="checkbox" onclick="checkAll(document.getElementById('posts-filter'));" /> </th>
+	<th scope="col" class="check-column"><input type="checkbox" onclick="checkAll(document.getElementById('posts-filter'));" /> </th>
 	<th><?php _e('Username') ?></th>
 	<th><?php _e('Name') ?></th>
 	<th><?php _e('E-mail') ?></th>