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Index: includes/common.inc
--- includes/common.inc Base (1.770)
+++ includes/common.inc Locally Modified (Based On 1.770)
@@ -2885,6 +2886,9 @@
     'item_list' => array(
       'arguments' => array('items' => array(), 'title' => NULL, 'type' => 'ul', 'attributes' => NULL),
     ),
+    'item_list_item' => array(
+      'arguments' => array('data' => NULL, 'attributes' => NULL),
+    ),
     'more_help_link' => array(
       'arguments' => array('url' => NULL),
     ),
Index: includes/theme.inc
--- includes/theme.inc Base (1.424)
+++ includes/theme.inc Locally Modified (Based On 1.424)
@@ -1473,59 +1458,96 @@
  *   All other elements are treated as attributes of the list item element.
  * @param $title
  *   The title of the list.
- * @param $attributes
- *   The attributes applied to the list element.
  * @param $type
- *   The type of list to return (e.g. "ul", "ol")
+ *   The type of list to return (e.g. "ul", "ol").
+ * @param $attributes
+ *   The attributes to be applied to the list element.
  * @return
  *   A string containing the list output.
  */
 function theme_item_list($items = array(), $title = NULL, $type = 'ul', $attributes = NULL) {
-  $output = '<div class="item-list">';
+  // We build the output from the inside, wrapping it with opening and closing tags.
+  $output = "<$type" . drupal_attributes($attributes) . '>' . _theme_item_list($items) . "</$type>";
   if (isset($title)) {
-    $output .= '<h3>' . $title . '</h3>';
+    $output = "<h3>$title</h3>$output";
   }
+  
+  return '<div class="item-list">' . $output . '</div>';
+}
 
-  if (!empty($items)) {
-    $output .= "<$type" . drupal_attributes($attributes) . '>';
-    $num_items = count($items);
-    foreach ($items as $i => $item) {
-      $attributes = array();
-      $children = array();
-      if (is_array($item)) {
-        foreach ($item as $key => $value) {
-          if ($key == 'data') {
+/**
+ * Helper to theme list of items for theme_item_list().
+ *
+ * @param $items
+ *   An array of items to be displayed in the list. If an item is a string,
+ *   then it is used as is. If an item is an array, then the "data" element of
+ *   the array is used as the contents of the list item. If an item is an array
+ *   with a "children" element, those children are displayed in a nested list.
+ *   All other elements are treated as attributes of the list item element.
+ * @return
+ *   A string containing the list output.
+ */
+function _theme_item_list($items = array()) {
+  $items_out = array();
+  $num_items = count($items);
+  $i = 0;
+  foreach ($items as $item) {
+    $i++;
+    $attributes = array();
+    $children = array();
+    if (is_array($item)) {
+      $data = '';
+      foreach ($item as $key => $value) {
+        switch ($key) {
+          case 'data':
             $data = $value;
-          }
-          elseif ($key == 'children') {
+            break;
+
+          case 'children':
             $children = $value;
-          }
-          else {
+            break;
+
+          default:
             $attributes[$key] = $value;
-          }
         }
       }
-      else {
-        $data = $item;
-      }
-      if (count($children) > 0) {
-        $data .= theme_item_list($children, NULL, $type, $attributes); // Render nested list
-      }
-      if ($i == 0) {
-        $attributes['class'] = empty($attributes['class']) ? 'first' : ($attributes['class'] . ' first');
-      }
-      if ($i == $num_items - 1) {
-        $attributes['class'] = empty($attributes['class']) ? 'last' : ($attributes['class'] . ' last');
-      }
-      $output .= '<li' . drupal_attributes($attributes) . '>' . $data . "</li>\n";
     }
-    $output .= "</$type>";
+    else {
+      $data = $item;
+    }
+    if (count($children) > 0) {
+      $data .= theme_item_list($children, NULL, $type, $attributes); // Render nested list
+    }
+
+    $zebra = ($i & 1) ? 'odd' : 'even';
+    $attributes['class'] = empty($attributes['class']) ? $zebra : $attributes['class'] . ' ' . $zebra;
+    if ($i == 0) {
+      $attributes['class'] .= ' first';
+    }
+    if ($i == $num_items - 1) {
+      $attributes['class'] .= ' last';
+    }
+    $items_out[] = theme('item_list_item', $data, $attributes);
   }
-  $output .= '</div>';
-  return $output;
+  
+  return "\n" . implode("\n", $items_out) . "\n";
 }
 
 /**
+ * Return a themed item for a list.
+ *
+ * @param $data
+ *   Data containing HTML for the item.
+ * @param $attributes
+ *   The attributes to apply to the item.
+ * @return
+ *   A string containing the item.
+ */
+function theme_item_list_item($data = NULL, $attributes = NULL) {
+  return '<li' . drupal_attributes($attributes) . '>' . $data . '</li>';
+}
+
+/**
  * Returns code that emits the 'more help'-link.
  */
 function theme_more_help_link($url) {